Fatigue is different from drowsiness -- drowsiness tends to be simply the feeling of a need for sleep while fatigue involves a lack of energy and motivation as well. Drowsiness and apathy (a feeling of indifference or not caring about what happens) can be symptoms of fatigue. The pattern of fatigue may help define its underlying cause. Individuals who wake up in the morning rested but rapidly develop fatigue with activity may have an ongoing condition. Individuals who awaken with low energy and have fatigue that persists throughout the day may be suffering from depression. However, these are not absolutes. Chronic fatigue should be evaluated by your health care provider. Fatigue can be a normal and important response to physical exertion, emotional stress, or lack of sleep. However, it can also be a nonspecific sign of a medically serious psychological or physical disorder. Fatigue that is not relieved by enough sleep, good nutrition, or a low-stress environment should be medically evaluated. Because fatigue is a common complaint, a potentially serious cause can be overlooked.
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