

COVID-19: Evaluation and management of adults following acute viral illness. Centers for Disease Control and Prevention. Post-COVID conditions: Overview for healthcare providers.

Chronic fatigue syndrome involves extreme fatigue that worsens with physical or mental activity, but doesn't improve with rest. Some symptoms are similar to those caused by chronic fatigue syndrome and other chronic illnesses that develop after infections. It's also not clear if post- COVID-19 syndrome is new and unique to COVID-19. Keep in mind that it can be hard to tell if you are having symptoms due to COVID-19 or another cause, such as a preexisting medical condition.
