Post-COVID or long COVID describes a group of symptoms and complications that affect the nervous system after a confirmed or probable COVID-19 infection.*

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Common symptoms include brain fog, fatigue, and breathlessness, but there are also other symptoms that are explained in this Guide. In general, symptoms can negatively affect everyday functioning.

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Symptoms may occur shortly after the acute COVID illness or may arise weeks or months afterwards. 

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Long COVID symptoms can increase or decrease in response to activities/effort level, although this may not be the case for everyone right from the start.

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*Adapted from the World Health Organization definition.