单项选择题

Fatigue is one of the most common complaints brought to doctors, friends, and relatives. You’d think in this era of labor-saving devices and convenient transportation that few people would have reasons to be so tired. But probably more people complain of fatigue today than in the days when hay was baled by hand and laundry scrubbed on a washboard.
The causes of modern-day fatigue are diverse and only rarely related to excessive physical exertion. The relatively few people who do heavy labor all day long almost never complain about being tired, perhaps because they expect to be. Today, physicians report tiredness is more likely a conse-quence of under-exertion than of wearing yourself down with over-activity. In fact, increased physical activity is often prescribed as a cure for lowering energy.
Psychological and emotional problems and conflicts, especially depression and anxiety, are by far the most common causes of prolonged fatigue. Fatigue may represent a defense mechanism that pre-vents you from having to face the true cause of your depression, such as the fact that you hate your job. It is also your body’s safety mechanism for expressing repressed emotional conflicts, such as feeling trapped in an ungrateful role or an unhappy marriage. When such feelings are not expressed openly, they often come out as physical symptoms, with fatigue as one of the most common manifes-tations. "Many people who are extremely fatigued don’t even know they’re depressed, " Dr. Bulette says. "They’re so busy distracting themselves or just worrying about being tired that they don’t recognize their depression. \

What is one of the most common complaints people often make().

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