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2. Lethargy vs. Fatigue

While lethargy and fatigue are often used interchangeably, they are not the same. Fatigue is a feeling of weariness, lack of motivation, irritability, or sleepiness that results from a period of physical or mental activity, rather than an illness. The symptoms someone experiences with lethargy and fatigue are similar, but the causes are different.

Fatigue Exertion Physical Nicola Katie / Getty Images
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