Lethargy

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Lethargy is a state of physical or mental weariness, fatigue, sluggishness, or lack of energy. It can be accompanied by depression, decreased motivation, or apathy, but can also present with having a desire, but not the energy to initiate or perform tasks. Lethargy can be a normal response to inadequate sleep, overexertion, overworking, stress, lack of exercise, improper nutrition, drug abuse, boredom, or a symptom of an underlying illness or disorder. It may also result from medication side effects, the consumption of illicit substances or an interaction between medications and alcohol. It may also be an altered level of consciousness. When part of a normal response, lethargy often resolves with rest, adequate sleep, decreased stress, physical exercise, and good nutrition. Its symptoms, however, can last days or even months, so it can be a sign of a recent underlying illness or infection if it does not resolve normally.

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