Fatigue is a feeling of tiredness or exhaustion or a need to rest
because of lack of energy or strength.
Fatigue may result from overwork, poor sleep, worry, boredom, or lack of exercise. It is a symptom that may be caused by illness, medicine, or medical treatment such as chemotherapy. Anxiety or depression can also cause fatigue.
William H. Blahd, Jr., MD, FACEP - Emergency Medicine & Martin J. Gabica, MD - Family Medicine