Fatigue is worse than feeling worn out or sleepy. Fatigue and a bad headache which linger for weeks after your initial illness has passed, are hallmark symptoms of the flu, according to PeaceHealth, US.

Many people have shared how they experience extreme levels of fatigue during a COVID infection. "Jeez, the post-Covid brain fog and fatigue are so real. After missing 7 days of work and trying to now catch up, I physically feel like I've just run a marathon, and I keep forgetting what it was that I was doing," a Twitter user with the username Jo Boots shared.

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