Acute and Chronic Pain

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What Is Acute Pain?

Acute pain usually begins suddenly and lasts for a short period. It often acts as a warning that the body has been injured or that something needs medical attention. Common causes include cuts, burns, infections, broken bones, dental problems, surgery and childbirth.

Acute pain normally improves as the injury or illness heals. However, severe or poorly controlled acute pain can sometimes continue beyond the expected healing period and become chronic.

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What Is Chronic Pain?

Chronic pain lasts or repeatedly returns for more than three months, or continues beyond the expected healing time. It may develop after an injury, illness or operation, but it can also occur without a clearly identifiable cause.

Chronic pain can affect movement, sleep, mood, concentration, relationships and the ability to work or complete everyday activities. The pain is real even when scans or other tests do not show a clear explanation.

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What Causes Pain?

Acute pain is often caused by tissue damage, inflammation, illness or injury. Chronic pain may be connected to an ongoing condition such as arthritis, migraine, cancer, endometriosis, nerve damage or back problems. It can also remain after the original injury has healed.

Pain is influenced by a combination of biological, psychological and social factors. Stress, poor sleep, previous experiences, mood and a person’s environment can affect how strongly pain is felt, but this does not mean the pain is imagined or “all in the mind.”

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Types of Pain

Nociceptive pain is caused by tissue damage or inflammation. It may feel sharp, tender, throbbing or aching and can occur with an injury, infection or inflammatory condition.

Neuropathic pain results from damage or changes to the nerves. It is often described as burning, tingling, shooting, stabbing or similar to an electric shock.

Nociplastic pain is associated with changes in how the nervous system processes pain, without clear evidence that tissue or nerve damage fully explains it. Fibromyalgia and some forms of persistent back pain are examples.

Pain may also be episodic, meaning it occurs at intervals rather than being present continuously. A person can experience more than one type of pain at the same time.

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How Is Pain Treated?

Treatment depends on whether the pain is acute or chronic, what is causing it and how it affects the person’s life. Acute pain treatment often focuses on treating the injury or illness while providing short-term pain relief.

Chronic pain usually requires a broader approach. The goal may be to reduce symptoms while improving movement, sleep, independence and participation in meaningful activities. Treatment can include medicines, physical or occupational therapy, psychological support, medical procedures and self-management strategies.

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Medicines and Medical Procedures

Different medicines work for different types of pain. Options may include nonprescription pain relievers, anti-inflammatory medicines or prescription treatments. Some medicines originally developed for depression or epilepsy are also used for certain forms of nerve or chronic pain.

Injections, nerve blocks, implanted devices or surgery may be considered in selected situations. Every treatment can have risks and side effects, so medicines should be reviewed with a healthcare professional and used according to the recommended dose.

Risks

Anyone can develop acute or chronic pain. The likelihood of persistent pain may be higher after a significant injury, operation, infection or repeated episodes of acute pain. Conditions involving inflammation, nerve damage, headaches, arthritis or the back may also increase the risk.

Sleep difficulties, stress, anxiety, depression and limited social support can make pain harder to manage or contribute to it becoming more disabling. These factors do not make the pain less physical or less valid.

Symptoms

Pain may feel aching, burning, cramping, stabbing, shooting, throbbing, tingling or electric. It may remain in one place, spread to another area or be felt throughout the body. The intensity can remain stable or change throughout the day.

Chronic pain may also be accompanied by stiffness, reduced movement, muscle tension, weakness, fatigue, poor sleep, difficulty concentrating, irritability, anxiety or low mood. Symptoms may worsen after certain activities, prolonged inactivity, illness, stress or disrupted sleep.

Diagnosis

Pain cannot be measured by a single blood test or scan. Assessment usually begins with questions about where the pain is located, how it feels, when it began, how often it occurs and what makes it better or worse. Its effect on sleep, movement, mood and daily activities is also important.

Depending on the symptoms, assessment may include a physical or neurological examination, blood tests, imaging or tests of nerve and muscle function. Sometimes no single cause is found, particularly with chronic pain.