Long COVID

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What Is Long COVID?

Long COVID, also called post-COVID condition or post-acute sequelae of SARS-CoV-2 infection, describes new, persistent, or recurring health problems that continue after the acute phase of COVID-19. Symptoms may involve several organs and can last for months or longer.

The condition can occur after mild, severe, or even initially unrecognized infection. Its presentation varies widely, and symptoms may fluctuate or worsen after physical or mental exertion.

What Causes Long COVID?

Long COVID is likely caused by several overlapping biological mechanisms rather than one single process. Proposed mechanisms include persistent immune activation, viral persistence, autonomic nervous system dysfunction, abnormal clotting or blood-vessel responses, and effects of organ injury from the initial infection.

Risk is generally higher after severe acute illness and repeated infections, but any infected person can develop prolonged symptoms. Vaccination reduces the risk of severe COVID-19 and may lower, but does not eliminate, the likelihood of Long COVID.

Diagnosis

Diagnosis is clinical and based on the history of infection, symptom pattern, duration, examination, and exclusion of other causes. Routine blood tests, imaging, or heart tests may be normal, so testing is selected according to the organs and symptoms involved.

Treatment Options

There is no single treatment that resolves all cases. Care focuses on the most disabling symptoms, pacing and activity management, sleep support, treatment of pain or autonomic symptoms, rehabilitation when appropriate, and management of newly identified medical conditions.

Rehabilitation must be individualized because some patients experience post-exertional malaise and may worsen with fixed incremental exercise programs. Coordinated care involving primary care and relevant specialists may be needed for complex cases.

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Living With Long COVID

Keeping a symptom and activity diary can help identify delayed worsening after exertion and guide pacing. Patients may need adjustments at work or school, scheduled rest, and gradual return to activities within their individual limits.

Sleep, nutrition, mental health, mobility, and social support should be addressed alongside physical symptoms. New symptoms should not automatically be attributed to Long COVID without appropriate medical evaluation.

When to Seek Emergency Care

Seek emergency care for severe breathing difficulty, persistent chest pain or pressure, fainting, new confusion, inability to stay awake, stroke-like symptoms, coughing blood, blue or gray discoloration, or a dangerously fast or irregular heartbeat.

Prognosis

Recovery is variable. Many people improve gradually, while others experience relapsing symptoms or prolonged disability. Ongoing research is refining diagnosis and treatment, and regular reassessment is important as symptoms and functional needs change.

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Risks

Long COVID can affect people of any age and after infections of any severity. Reported risk factors include severe acute COVID-19, hospitalization, repeated infections, older age, female sex, obesity, certain chronic conditions, and lack of vaccination, although people without these factors may also be affected. The condition can lead to reduced mobility, loss of work capacity, social isolation, and worsening of existing disease.

Symptoms

Common symptoms include severe fatigue, post-exertional malaise, shortness of breath, persistent cough, chest pain, palpitations, dizziness on standing, brain fog, memory or concentration problems, headache, sleep disturbance, muscle or joint pain, altered smell or taste, digestive symptoms, anxiety or depression, and changes in menstrual cycles. Symptoms may appear, disappear, and return over time.

Diagnosis

Long COVID is diagnosed through a detailed history of the initial illness, the onset and course of later symptoms, physical examination, and assessment of functional impact. A positive historical test can support the diagnosis but is not always available or required because some infections were never tested.

Testing is guided by symptoms and may include blood counts, metabolic and thyroid tests, oxygen measurement, electrocardiography, chest imaging, pulmonary function tests, cardiac evaluation, cognitive screening, or autonomic testing. Clinicians also evaluate for anemia, sleep disorders, heart or lung disease, endocrine problems, and other treatable explanations.