Post-COVID Conditions (Long COVID)

What are post-COVID conditions (long COVID)?

From: MedlinePlus, National Library of Medicine

COVID-19 (coronavirus disease 2019) is an illness caused by a virus. Many people get better within a few days or weeks after being infected with the virus. But others have post-COVID conditions. They may:

• Have symptoms that linger for weeks, months, or even years
• Seem to recover from COVID-19 but then see their symptoms return
• Develop new symptoms or new health conditions within a few months of having COVID-19

There are several other names for post-COVID conditions. It is often called long COVID. But it can also be called long-haul COVID, long-term effects of COVID, chronic COVID, post-acute COVID-19, and post-acute sequelae of SARS-CoV-2 (PASC).

Who is more likely to develop post-COVID conditions (long COVID)?

From: MedlinePlus, National Library of Medicine

Anyone who had COVID-19, whether it was severe or mild, can have long-lasting symptoms. But you are at higher risk of post-COVID conditions if you:

• Had severe COVID-19 illness, especially if you were hospitalized or needed intensive care.
• Had underlying health conditions before you got COVID-19.
• Did not get a COVID-19 vaccine.
• Had multisystem inflammatory syndrome (MIS) during or after COVID-19. MIS is a rare but serious condition in which different body parts become inflamed.

What are the symptoms of post-COVID conditions (long COVID)?

From: MedlinePlus, National Library of Medicine

Post-COVID conditions do not affect everyone the same way. They can cause various types and combinations of symptoms in different people. The symptoms may affect different parts of the body, for example:

• General symptoms, such as fatigue and fever
• Respiratory symptoms, such as trouble breathing and cough
• Heart symptoms, such as chest pain and palpitations
• Neurologic symptoms such as trouble thinking and concentrating ("brain fog"), headaches, and sleep problems
• Digestive symptoms such as diarrhea and stomach pain

Some people may have a wide variety of symptoms that are similar to those of other conditions, such as myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS).

Most people's symptoms slowly improve over time. But for some people, the symptoms can last weeks, months, or longer. Sometimes the symptoms are severe enough to result in disability.

How are post-COVID conditions (long COVID) diagnosed?

From: MedlinePlus, National Library of Medicine

There is no specific test for post-COVID conditions. To find out if you have a post-COVID condition, your provider:

• Will ask about your medical history. This includes asking if you have had a diagnosis of COVID-19, either based on a positive test, symptoms, or exposure.
• Will do a physical exam.
• May order blood and imaging tests.

Some of the symptoms of post-COVID conditions may be hard to explain. The results of blood and imaging tests may be normal. And people who have unexplained symptoms may sometimes be misunderstood by their providers. So it can take some time to get a diagnosis.

What are the treatments for post-COVID conditions (long COVID)?

From: MedlinePlus, National Library of Medicine

There is no specific treatment for post-COVID conditions yet. You and your provider can work together to create a personal care plan to manage your symptoms and improve your quality of life.

Can post-COVID conditions (long COVID) be prevented?

From: MedlinePlus, National Library of Medicine

The best way to prevent post-COVID conditions is to avoid getting COVID-19. Staying up to date with vaccines (including boosters) against COVID-19 can help prevent COVID-19 infection and protect against severe illness.

Understanding terms used in the source

These definitions explain medical words used above. A definition is not evidence that another condition is present, and it does not predict how a symptom will develop. Ask the clinician which terms apply to the actual examination or test result.

Chronic fatigue

Subjective feeling of tiredness characterized by a lack of energy and motivation that persists for six months or longer.

Palpitations

A sensation that the heart is pounding or racing, which is a non-specific sign but may be a manifestation of arrhythmia.

Chest pain

An unpleasant sensation characterized by physical discomfort (such as pricking, throbbing, or aching) localized to the chest.

Brain fog

Brain fog is a type of transient cognitive dysfunction that comprises a constellation of symptoms that impair intellectual functioning to a level that interferes with daily activities, commonly including forgetfulness, mental slowness, difficulty thinking or focusing, a perceived slowing of mental processing speed, inability to find the right words, a sensation that the mind went blank or is "cloudy". Brain fog tends to recur and may be triggered by factors such as physical fatigue, lack of sleep, and prolonged standing or may appear to occur spontaneously.

Diarrhea

Abnormally increased frequency (usually defined as three or more) loose or watery bowel movements a day.

Which doctor should you see?

The suggested department for discussing Post-COVID Conditions (Long COVID) is Infectious Diseases, with a general physician / infectious disease specialist as the relevant type of clinician. General physician / Family Medicine; paediatrician for children. Referral depends on symptoms.

This is an editorial referral starting point. The appropriate clinic depends on the person’s age, symptoms, previous diagnosis and local services. The first clinician can decide whether another specialty or a team is needed; a department label does not confirm the diagnosis.

How to prepare for an assessment

Bring a short timeline of the main symptoms: when they first appeared, whether they are constant or episodic, what seems to change them, and how they affect daily activities. Include previous reports, discharge summaries, current medicines and supplements, allergies, and any relevant family history. A dated record is more useful than trying to match every feature in an online article.

Ask the clinician what is already established and what remains uncertain. If a test is suggested, ask what question it answers, what its limitations are and how the result would change the next step. The information here is not an instruction to arrange every possible test. In children, bring growth, developmental and school information if it is relevant to the concern.

• Which exposure or organism is suspected, and what evidence would confirm it?
• Are precautions, vaccination or advice for close contacts relevant to this infection?
• What should happen if symptoms worsen or do not improve as expected?

Treatment discussions and follow-up

Where the source describes treatments, these are an overview of possible care, not a prescription for an individual. Ask which option applies to the confirmed diagnosis, what benefit is expected, what adverse effects to watch for and how progress will be assessed. Availability, approvals and local practice can differ from the country described in the source.

Before leaving the appointment, clarify the next review date, who will communicate results, and whom to contact if the situation changes. Discuss difficulties with sleep, work, school, mobility, eating or emotional wellbeing when these are relevant. Practical support may require coordination between the treating clinician and other services.

When to seek emergency help

Severe breathing difficulty, collapse, new stroke-like symptoms, a seizure that is prolonged or repeated without recovery, uncontrolled major bleeding, or an immediate risk of self-harm require emergency help. In India, call 112 or reach the nearest emergency department. This is a general, non-exhaustive warning list; it is not a condition-specific triage tool.