Perianal Crohn’s Disease and Fistulas: What to Do and When to Get Specialist Help

What is perianal Crohn’s disease?

Perianal Crohn’s disease is Crohn’s disease that causes problems in the area around the anus. These problems can include fistulas, abscesses, fissures, ulcers, skin tags, and narrowing of the anal canal.[1,4]

Crohn’s disease causes inflammation in the digestive tract. Unlike inflammation limited to the surface of the bowel, Crohn’s can affect the full thickness of the intestinal wall. This helps explain why complications such as fistulas can develop.[6]

A fistula forms when an abnormal channel develops between two surfaces. In a perianal fistula, that tunnel usually connects the anal canal or rectum with an opening in the skin around the anus.[1]

Perianal disease is not the same for everyone. Some fistulas are relatively straightforward. Others have several branches, occur alongside an abscess, or involve more of the muscles responsible for bowel control.

These differences are important when specialists assess fistulizing Crohn’s disease and consider appropriate management.


{{get-started}}
‍

What can a colonoscopy show in Crohn’s disease?

A colonoscopy allows a doctor to look directly at the inside of your colon and usually the terminal ileum, the last part of the small intestine.

During the procedure, a flexible tube with a camera is passed through the rectum and around the colon.

The doctor looks at the bowel lining for signs of inflammation and other abnormalities.

In Crohn’s disease, this can include:

• redness and swelling
• ulcers
• patchy areas of inflammation
• changes to the normal surface of the bowel
• narrowing
• bleeding or fragile tissue
• inflammation in the terminal ileum

The doctor can also take biopsies, which are tiny tissue samples examined under a microscope.

This is important because what the bowel looks like through the camera and what the tissue looks like under a microscope provide different information.

What does Crohn’s disease look like on a colonoscopy?

Crohn’s can have several characteristic appearances, but there is no single colonoscopy finding that appears in everyone with the condition.

One feature doctors may see is patchy inflammation.

Unlike inflammation that runs continuously along the bowel, Crohn’s can affect one area while leaving another area relatively normal. These separated areas are sometimes called skip lesions.

Doctors may also see ulcers.

These can range from small superficial ulcers to larger or deeper areas of ulceration.

More pronounced Crohn’s inflammation can sometimes create a cobblestone appearance, where areas of swollen tissue are separated by deeper ulcers.

Inflammation around the terminal ileum is also common in Crohn’s.

These findings can support a diagnosis, but they are not interpreted on their own. Your gastroenterologist will consider the overall pattern and other test results before deciding what the findings mean. [1,2]

What does “ileitis” mean on a colonoscopy report?

Ileitis means inflammation of the ileum, the final part of the small intestine.

The terminal ileum is particularly relevant in Crohn’s because it is a common location for the disease.

If your report says terminal ileitis, it means the doctor saw evidence of inflammation in this area.

It does not, by itself, mean you definitely have Crohn’s disease.

Ileitis can have causes other than Crohn’s, including certain infections and medication-related injury. The appearance of the inflammation, biopsy findings, symptoms, medical history, and other investigations help doctors work out the cause. [1,2]

So if your report says “ileitis,” the useful question for your gastroenterologist is:

“What do you think is causing the inflammation?”

rather than assuming the word itself confirms a diagnosis.

What do ulcers mean on a Crohn’s colonoscopy?

Ulcers are areas where inflammation has damaged the surface of the bowel lining.

They can occur in Crohn’s disease.

Your report may describe them in different ways, including aphthous ulcers, superficial ulcers, or deep ulcers.

Aphthous ulcers are small areas of ulceration. More active or severe inflammation can be associated with larger or deeper ulcers.

The presence, size, depth, and extent of ulcers can contribute to a doctor's assessment of disease activity.

But an ulcer is not a diagnosis by itself.

The pattern matters.

Your gastroenterologist will consider where the ulcers are, what the surrounding bowel looks like, what the biopsies show, and whether the overall picture is consistent with Crohn’s.

What does “cobblestoning” mean in Crohn’s disease?

Cobblestoning describes a particular appearance of the bowel lining that can occur in Crohn’s disease.

Deep ulcers can intersect with areas of swollen or relatively preserved tissue, creating a surface that resembles cobblestones.

It is a classic description associated with Crohn’s.

Seeing the word on a report can sound alarming, but it should not be interpreted in isolation as a prediction of what will happen next.

It describes an appearance.

Your healthcare team still needs to consider how much of the bowel is affected, how active the disease appears overall, whether complications are present, and what other tests show.

What are “skip lesions” on a colonoscopy?

Skip lesions are areas of inflamed bowel separated by areas that appear relatively unaffected.

This patchy pattern is characteristic of Crohn’s disease.

For example, the doctor might see inflammation in the terminal ileum and another section of the colon while the bowel between those areas looks relatively normal.

This is different from the continuous pattern of inflammation more typically associated with ulcerative colitis.

However, real-world appearances are not always textbook-perfect.

That is another reason doctors use colonoscopy alongside biopsies and other information rather than relying on one visual feature to distinguish inflammatory bowel diseases. [1,2]

What does a stricture mean on your colonoscopy report?

A stricture is an area where the bowel has become narrowed.

Crohn’s can lead to narrowing because of active inflammation, longer-term scarring, or a combination of both.

During a colonoscopy, the doctor may see a narrowed area or find that the scope cannot safely pass through part of the bowel.

A stricture can be important because significant narrowing can make it harder for food and bowel contents to pass through.

But a colonoscopy cannot always tell doctors everything they need to know about a stricture.

Imaging such as magnetic resonance enterography (MRE), intestinal ultrasound, or CT enterography may provide more information about the bowel wall and areas beyond the reach of the colonoscope. [2]

If a stricture appears on your report, ask:

“How significant is the narrowing, and do I need another test to assess it?”

If you develop severe abdominal pain, persistent vomiting, a swollen abdomen, or an inability to pass stool or gas, seek urgent medical assessment because these can occur with bowel obstruction.

Why are biopsies taken during a Crohn’s colonoscopy?

Biopsies let a pathologist examine tiny samples of bowel tissue under a microscope.

This can reveal changes that are not obvious from the colonoscopy camera alone.

Biopsies may be taken from inflamed areas and from areas that appear normal.

When Crohn’s is being investigated, the pathology findings can help doctors understand the type and pattern of inflammation and distinguish between possible causes.

You may see terminology such as:

• active inflammation
• chronic inflammation
• chronic active inflammation
• crypt changes
• granulomas
• no significant abnormality

These words need context.

For example, chronic inflammation generally indicates changes associated with inflammation that has been present over time. “Active” refers to features of current inflammatory activity.

Neither phrase, on its own, tells you everything about the severity or future course of your Crohn’s.

What does a granuloma mean on a Crohn’s biopsy?

A granuloma is a particular collection of immune cells that can sometimes be seen under the microscope in Crohn’s disease.

When an appropriate type of granuloma is found in the right clinical context, it can support a Crohn’s diagnosis.

But there are two important things to know.

First, many people with Crohn’s do not have granulomas on their biopsies.

Not finding one does not rule Crohn’s out.

Second, granulomas can have other causes, so the pathologist and gastroenterologist still interpret the finding in the context of the whole investigation.

Do not worry if your biopsy report does not mention granulomas.

They are one possible clue, not a requirement for Crohn’s disease.

Can a colonoscopy confirm a Crohn’s disease diagnosis?

A colonoscopy with biopsies is an important part of diagnosing Crohn’s disease, but there is no single test that confirms every case.

Doctors generally make a Crohn’s diagnosis using a combination of information.

That can include:

• your symptoms and medical history
• physical examination
• blood tests
• stool tests
• ileocolonoscopy and biopsies
• imaging of the small intestine

Current ECCO diagnostic guidance recommends ileocolonoscopy with biopsies together with intestinal imaging as first-line investigations in people with suspected inflammatory bowel disease. [2]

That is because Crohn’s can occur anywhere in the digestive tract and can affect the bowel in ways that colonoscopy alone cannot fully assess.

So you may finish a colonoscopy and still be asked to have another test.

That does not necessarily mean the colonoscopy was inconclusive or unsuccessful.

The tests answer different questions.

Can you have Crohn’s disease if your colonoscopy is normal?

Yes. A normal colonoscopy does not always exclude Crohn’s disease.

A standard colonoscopy examines the colon and usually the terminal ileum.

But Crohn’s can affect other parts of the small intestine that the scope cannot reach.

If your symptoms, blood tests, stool tests, or other information continue to raise concern about Crohn’s despite a normal colonoscopy, your healthcare team may consider additional testing.

This can include MRE, intestinal ultrasound, or capsule endoscopy in selected situations. [2]

Capsule endoscopy involves swallowing a small camera that takes images as it travels through the digestive tract.

It is not appropriate for everyone—for example, suspected narrowing can affect whether capsule endoscopy is suitable—so the choice of test depends on the individual situation.

What does a normal colonoscopy mean if you already have Crohn’s?

If you have established Crohn’s and your colonoscopy shows little or no visible inflammation, that can be encouraging.

It may indicate endoscopic remission or healing, depending on the findings and terminology used.

This matters because modern Crohn’s treatment aims beyond symptom control alone.

You may feel well while inflammation remains. Conversely, you can have some digestive symptoms even when Crohn’s inflammation has improved considerably.

That is why colonoscopy can sometimes be used to assess how well treatment is controlling the disease. [2,3]

A reassuring colonoscopy does not mean Crohn’s has been cured.

Crohn’s is a chronic condition, and maintenance treatment and follow-up may still be needed.

Do not stop medication because a colonoscopy looks good unless your healthcare team has specifically discussed changing your treatment.

What does SES-CD mean on a Crohn’s colonoscopy report?

SES-CD stands for Simple Endoscopic Score for Crohn’s Disease.

It is one system used to describe the amount of Crohn’s activity seen during ileocolonoscopy.

The score considers features including:

• the size of ulcers
• how much of the bowel surface is ulcerated
• how much of the bowel surface is affected
• whether there is narrowing

These features are assessed in different sections of the bowel.

You may see an SES-CD number in your report, particularly in specialist IBD care or when disease activity is being assessed systematically.

The number should not be interpreted as a standalone verdict on how “bad” your Crohn’s is.

Your healthcare team considers it alongside your symptoms, previous colonoscopies, biomarkers, imaging, treatment, and overall clinical situation.

If you see an unfamiliar score in your report, mama health can help you understand what the terminology refers to, while your gastroenterologist can explain what your individual score means medically.

What does “mild,” “moderate,” or “severe” inflammation mean?

These words describe the degree of inflammation seen or reported, but their exact meaning depends on the context in which they are used.

A colonoscopy report may describe a particular section of bowel as mildly, moderately, or severely inflamed.

That is not necessarily identical to describing your overall Crohn’s disease as mild, moderate, or severe.

Your overall situation can depend on much more than the appearance of one area.

Doctors may consider:

• how much bowel is affected
• the depth of ulcers
• symptoms
• blood and stool markers
• strictures, fistulas, or abscesses
• nutritional effects
• previous disease behavior
• imaging findings

So if your report says “mild inflammation,” do not assume that automatically tells you what treatment you need.

And if it says “severe,” do not assume the word predicts your long-term future.

Ask how the finding fits into the bigger picture.

Why might your colonoscopy results and symptoms not match?

Because symptoms and Crohn’s inflammation do not always move together.

You can have substantial symptoms without a large amount of visible inflammation.

You can also feel relatively well despite inflammation still being present.

This is why modern Crohn’s follow-up does not rely only on how you feel. Objective information from biomarkers, imaging, and endoscopy can help healthcare teams assess disease activity and treatment response. [2,3]

If your colonoscopy looks reassuring but you are still having diarrhea, pain, or bloating, that does not mean your symptoms are imaginary.

Your healthcare team may consider other explanations and decide whether further assessment is needed.

Likewise, if you feel well but your colonoscopy still shows inflammation, your doctor may want to discuss whether the current treatment is achieving its intended target.

What happens after a colonoscopy suggests Crohn’s disease?

The next step depends on how complete the diagnostic picture is.

If biopsies were taken, you may need to wait for the pathology report.

Your healthcare team may also want additional blood tests, stool tests, or imaging.

Once the available information has been reviewed, your gastroenterologist can discuss whether the findings support a Crohn’s diagnosis and what they mean for you.

If Crohn’s is diagnosed, the next questions usually become:

Where is the disease?

How active is it?

Are there complications?

What treatment makes sense?

Our guide to what happens after a new Crohn’s diagnosis explains that next stage in more detail.

What happens after a colonoscopy if you already have Crohn’s?

If the colonoscopy was performed to assess established Crohn’s, what happens next depends on what it shows.

If inflammation has improved substantially, your healthcare team may continue the current maintenance strategy.

If significant inflammation remains, they may consider whether the current treatment is achieving its goal.

That does not mean one abnormal colonoscopy result automatically leads to a new medicine.

Your gastroenterologist may consider your symptoms, biomarkers, imaging, how long you have been taking the treatment, previous response, and other factors before deciding what to do.

If treatment changes are being discussed, our guide to Crohn’s disease treatment options explains the main medication groups and the questions worth asking.

What should you ask your doctor about your Crohn’s colonoscopy results?

You do not need to understand every line of the report.

A few questions can make the findings much clearer:

• Which parts of my bowel did you examine?
• Where did you find inflammation?
• Was my terminal ileum affected?
• Were there ulcers?
• Did you see any narrowing?
• Were you able to examine the whole colon and terminal ileum?
• Where were biopsies taken?
• What did the biopsies show?
• Do these results support a Crohn’s diagnosis?
• Do I need imaging of the small intestine?
• If I already have Crohn’s, has the inflammation improved since my previous assessment?
• What happens next?
• Do these findings change my treatment?

If your doctor uses a term you do not understand, ask them to explain it.

Medical reports are written primarily to communicate between healthcare professionals. You are not failing some test by finding them difficult to read.

How can mama health help you understand a colonoscopy report?

A colonoscopy report can arrive long before you have had a chance to discuss every line with your gastroenterologist.

That gap can be uncomfortable.

You might see terminal ileitis and wonder whether it confirms Crohn’s. You might see ulceration and worry about what it means. Or your report might contain an SES-CD score without explaining what the letters stand for.

With mama health, you can:

• Understand your medical reports. Make unfamiliar terms such as ileitis, ulceration, biopsies, strictures, and SES-CD easier to understand.
• Ask questions about Crohn’s. Get clear information about terminology and the tests commonly used when Crohn’s is investigated or followed up.
• Learn from people living with Crohn’s. Explore what other people experienced around colonoscopy preparation, waiting for results, follow-up appointments, and ongoing care.
• Find specialists and care near you. Explore relevant gastroenterology and IBD care when you want to understand what specialist support is available.

mama health does not determine whether a colonoscopy confirms Crohn’s disease, assess how severe your disease is, or decide whether treatment should change.

Those conclusions belong with your healthcare team.

But understanding the words on the page can make the conversation with them much easier.

What should you remember when reading your Crohn’s colonoscopy results?

A colonoscopy report is one part of the story.

Words such as ulcer, ileitis, stricture, or cobblestoning can sound frightening when you see them without context.

Try not to turn one word into a conclusion.

An abnormal finding does not tell you everything about how your Crohn’s will behave.

A normal-looking colonoscopy does not always exclude disease elsewhere in the digestive tract.

And if you already have Crohn’s, a good colonoscopy result does not necessarily mean treatment and follow-up are finished.

Instead, bring the report back to three questions:

What did you find?

How does it fit with my other results?

What happens next?

Those answers are much more useful than trying to interpret the report one unfamiliar word at a time.

‍

What does a perianal fistula feel like?

A perianal fistula can cause pain, irritation, swelling, drainage, bleeding, or a small opening near the anus. Symptoms can persist or repeatedly improve and return.[1,7]

Possible signs include:

• a tender lump or swelling around the anus
• pain when sitting or moving
• pain during bowel movements
• irritation of the surrounding skin
• drainage of pus, blood, mucus, or stool
• unpleasant-smelling discharge
• a visible opening or recurring sore near the anus.[1,7]

Symptoms can change if the fistula stops draining. A reduction in discharge does not necessarily mean that the fistula has healed.

If an external opening closes while infection remains underneath the skin, an abscess can develop. Changes in pain, swelling, drainage, or fever are therefore useful details to discuss with a healthcare professional.

What is the difference between a fistula and an abscess?

A fistula is an abnormal tunnel, while an abscess is a collection of pus caused by infection. The two problems can occur together.[2,3]

An abscess around the anus may cause a swollen, red, tender lump. Pain can become severe or throbbing and may be worse during bowel movements. Fever and pus discharge can also occur.[2]

An abscess is particularly important because controlling infection is a priority in perianal Crohn’s disease. Abscesses may require drainage, alongside antibiotics when clinically appropriate.[2,4]

If you develop severe or rapidly worsening anal pain, increasing swelling or redness, fever, or feel generally unwell, seek prompt medical assessment.

Can a fistula be the first sign of Crohn’s disease?

Yes. A perianal fistula can sometimes appear before Crohn’s disease has been diagnosed. However, most people with an anal fistula do not have Crohn’s disease.[5]

Recent European guidance reports that perianal fistulas may be the first presentation of Crohn’s disease in up to about 10% of people with Crohn’s. At the same time, more than 90% of people presenting with a perianal fistula have a fistula originating from causes other than Crohn’s disease, most commonly a cryptoglandular fistula.[5]

Further investigation for Crohn’s may be considered when a fistula is recurrent or complex, or when other features point toward inflammatory bowel disease. These can include digestive symptoms, certain symptoms outside the digestive tract, a family history of inflammatory bowel disease, characteristic imaging findings, or elevated faecal calprotectin.[5]

Persistent diarrhea, abdominal pain, rectal bleeding, weight loss, fatigue, or recurrent perianal abscesses are therefore useful details to mention during an appointment.

How is perianal fistulizing Crohn’s disease assessed?

Assessment usually aims to understand the fistula’s anatomy, look for an abscess or infection, and determine whether Crohn’s inflammation is active elsewhere. More complex perianal Crohn’s often requires input from both gastroenterology and colorectal surgery.[4]

A healthcare team may use several approaches.

Physical examination

A clinician may examine the skin around the anus for openings, swelling, inflammation, discharge, scars, or signs of an abscess.

Pelvic MRI

Pelvic MRI can show the path of a fistula beneath the skin, including branches that cannot be seen externally. It can also help identify abscesses and show the relationship between a fistula and the anal sphincter muscles.[4]

Examination under anaesthesia

A colorectal surgeon may perform an examination under anaesthesia, often shortened to EUA. This allows the fistula and surrounding tissues to be assessed in detail and can sometimes be combined with drainage or another surgical procedure.[4]

Bowel assessment

Because inflammation in the rectum and elsewhere in the bowel can influence management, tests such as ileocolonoscopy may also form part of an assessment when Crohn’s disease is suspected or needs further evaluation.[5]

The exact combination of tests varies. A simple fistula and a complicated network of fistulas do not necessarily require the same assessment.

How is a perianal fistula treated in Crohn’s disease?

Perianal treatment often combines control of infection, management of Crohn’s inflammation, and selected surgical procedures. There is no single approach that is appropriate for every fistula.[4]

Treatment planning may consider whether an abscess is present, whether the fistula is simple or complex, whether the rectum is inflamed, which muscles are involved, previous treatment, and how much the symptoms affect daily life.

How are perianal abscesses treated?

Controlling infection is a priority when an abscess is present. Drainage allows trapped pus to leave the infected area and may be required before other treatment is considered.[2,4]

Antibiotics can also be used to control perianal infection or sepsis when appropriate. Current ECCO guidance does not recommend antibiotics alone as a treatment for closing complex Crohn’s fistulas.[4]

What is a seton and why is it used?

A seton is a thin surgical thread or loop placed through a fistula to help keep it draining. In Crohn’s disease, it can help control local infection and prevent an external opening from sealing while the fistula remains active underneath.[4]

For complex fistulas, seton drainage may form one part of a combined medical and surgical strategy.

ECCO advises against chronic seton treatment as the sole long-term treatment for most perianal Crohn’s fistulas.[4]

Which medicines are used for fistulizing Crohn’s disease?

Medical treatment aims to control the underlying inflammatory disease. Biologic medicines, particularly anti-TNF therapy, have an established role in perianal fistulizing Crohn’s disease.[4]

The choice of medicine depends on the individual clinical situation, including previous treatments and disease activity. Medical therapy may be coordinated with surgical drainage rather than considered separately from it.

A gastroenterologist can explain which medical options may be appropriate based on an individual assessment.

Can a Crohn’s fistula be surgically closed?

Some people may be considered for a procedure intended to close the fistula, but the appropriate technique depends heavily on fistula anatomy and surrounding inflammation. Protecting the anal sphincter and bowel-control function is an important consideration.[4]

For example, fistulotomy may be considered in carefully selected simple, superficial, or low fistulas when rectal inflammation is absent and intestinal Crohn’s disease is stable. It is not appropriate for every Crohn’s fistula.[4]

Other specialist procedures may be considered for selected complex fistulas.

Why does perianal Crohn’s often need specialist care?

Perianal Crohn’s can require specialist care because management depends on both the underlying Crohn’s inflammation and the anatomy of the fistula. Treating only one part of the problem may not be enough.[4]

A gastroenterologist can assess Crohn’s activity and medical therapy. A colorectal surgeon can assess fistula anatomy, drain abscesses, place setons, and discuss appropriate surgical options.

Radiologists, IBD nurses, stoma specialists, dietitians, and other healthcare professionals may also contribute depending on the situation.

This multidisciplinary approach is especially relevant when fistulas are complex, recurrent, associated with abscesses, or continue to cause symptoms despite previous treatment.[4]

When should you get medical help for perianal symptoms?

New or recurring pain, swelling, drainage, bleeding, or an opening near the anus is worth discussing with a healthcare professional, particularly if you already have Crohn’s disease.

Prompt assessment is particularly important when symptoms could indicate an abscess. These include:

• severe or rapidly worsening pain
• a new painful or tender lump
• increasing redness or swelling
• fever
• pus draining from the area
• feeling generally unwell.[2]

A fistula that repeatedly drains, closes, and becomes painful again also deserves medical attention.

Recurrent or complex perianal fistulas can be among the situations in which clinicians investigate for underlying Crohn’s disease.[5]

If you already have an IBD team, you could contact them when new perianal symptoms appear rather than waiting until a routine appointment.

What can you record before seeing your healthcare team?

Recording how your symptoms change can make it easier to explain what has been happening at an appointment.

You could note:

• when the pain, lump, or drainage first appeared
• whether symptoms are constant or come and go
• where the opening or swelling is located
• whether discharge looks like pus, blood, mucus, or stool
• whether you have had a fever
• whether sitting or bowel movements make the pain worse
• whether you have had similar abscesses or fistulas before
• whether your bowel symptoms have changed at the same time
• which medicines you currently take
• questions you want to discuss with your healthcare team.

You do not need to examine the fistula yourself or determine what type it is. The aim is simply to have a clearer record of your experience to discuss with your care team.

How can mama health support you between Crohn’s appointments?

mama health can help you organize questions and health information, learn from others living with Crohn’s disease, and prepare for conversations with your healthcare team.

Living with Crohn’s can mean keeping track of symptoms, appointments, test results, medicines, and questions you do not want to forget. mama health brings this information together in one place.

With mama health, you can:

• Find specialists and care near you. Search for relevant doctors and clinics and explore information about their areas of focus.
• Learn from others living with the same condition. Explore questions and experiences shared by people who understand what day-to-day life with a chronic condition can be like. Individual experiences vary and do not replace medical advice.
• Understand labs and medical reports in simpler language. Medical results, prescriptions, and reports can contain unfamiliar terminology. mama health provides educational explanations that can make this information easier to understand and discuss with your doctor.
• Prepare a structured report for an appointment. Bring together the symptoms, questions, results, medication experiences, and other information you choose to record into a summary you can take to your healthcare team.

For someone living with perianal Crohn’s disease, this could mean keeping questions about pain, drainage, previous procedures, medicines, test results, or upcoming appointments together instead of trying to remember everything during a consultation.

mama health provides information and organization for your own understanding and appointment preparation. It does not diagnose a fistula, determine which specialist you need, or decide which perianal treatment is appropriate for you.

What questions could you ask a Crohn’s specialist?

Useful questions focus on the fistula’s anatomy, infection, Crohn’s activity, treatment options, and what changes deserve urgent attention.

For example, you could ask:

• Is there an abscess or infection?
• Is the fistula considered simple or complex?
• Would pelvic MRI or another test provide useful information?
• Is there active inflammation in my rectum or elsewhere in my bowel?
• What is the purpose of a seton in my situation?
• How will medical and surgical treatment work together?
• What are the possible benefits and risks of the options being considered?
• What symptoms should prompt me to contact the team quickly?
• Who should I contact if the pain, swelling, or drainage changes?

Perianal Crohn’s can be difficult to talk about, but these symptoms are a familiar part of IBD care for gastroenterology and colorectal teams. Clear information about what you are experiencing can help make the conversation more useful.

Frequently asked questions about perianal Crohn’s and fistulas

Can a Crohn’s fistula heal on its own?

Perianal fistulas generally require medical assessment rather than relying on spontaneous healing. Crohn’s-related fistulas can involve ongoing inflammation, infection, or complex tracts beneath the skin.[4,7]

Even if pain or drainage improves, this does not necessarily confirm that the fistula itself has closed.

Does every perianal fistula mean Crohn’s disease?

No. Most people presenting with a perianal fistula do not have Crohn’s disease. Recent European guidance states that more than 90% of people presenting with a perianal fistula have a fistula originating from causes other than Crohn’s disease, most commonly a cryptoglandular fistula.[5]

Crohn’s disease may be investigated when other symptoms or characteristics of the fistula raise suspicion of inflammatory bowel disease.

Is drainage from a fistula always a sign that it is getting worse?

No. The amount of drainage from a fistula can change over time. Drainage alone cannot show whether the underlying fistula is improving or worsening.

A sudden reduction in drainage alongside increasing pain or swelling can be important because infection or an abscess may be present. These changes are worth discussing promptly with a healthcare professional.

Does every Crohn’s fistula need surgery?

No. Perianal treatment depends on the type of fistula, infection, Crohn’s inflammation, and the individual clinical situation. Surgical procedures can be important for draining infection, placing a seton, or attempting fistula closure, while medical therapy addresses Crohn’s inflammation.[4]

For complex fistulizing Crohn’s disease, specialists often coordinate medical and surgical approaches.

Can perianal Crohn’s come back after treatment?

Yes. Perianal fistulizing Crohn’s disease can recur after symptoms improve or a fistula has been treated. This is one reason ongoing follow-up may be important.[4]

New pain, swelling, drainage, or other changes can be discussed with your IBD team or another healthcare professional.

Living with Crohn’s disease can already involve abdominal pain, diarrhea, fatigue, and unpredictable flares. Symptoms around the anus can add another layer that may feel uncomfortable or embarrassing to discuss.

But pain, swelling, drainage, or a recurring sore near the anus deserves attention. These symptoms can occur with perianal Crohn’s disease, including a fistula or abscess.

Perianal problems can also occur in people who have not been diagnosed with Crohn’s disease. In some people, a perianal fistula can appear before more typical Crohn’s symptoms.[5]

Understanding what these symptoms can mean can make it easier to describe what you are experiencing and prepare for a conversation with a healthcare professional.

Disclaimer: This content is informational and not a medical device. mama health offers information and support and does not replace a doctor.