Fatigue is a feeling of weariness, tiredness, or lack of energy. It is different from drowsiness which is feeling the need to sleep, while fatigue is a lack of energy and motivation. Drowsiness and apathy (a feeling of indifference or not caring about what happens) may be associated with fatigue.

Symptom severities
Severe 39,716
Moderate 53,294
Mild 33,193
None 13,862
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