Fatigue is common among older adults and it has many possible causes

Fatigue, the leading reason for restricted activity in people 70 and older, commonly occurs with many illnesses and can sometimes be countered by new habits, including pacing one's activities, say health experts. Otherwise, fatigue, can lead to a vicious cycle where older adults stop being active and become deconditioned, resulting in muscle loss, weakness, and depression—all of which further increase fatigue.