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Depression, Fatigue May Fuel Each Other
Having One May Dramatically Increase the Risk of Developing the Other
WebMD Health NewsJune 18, 2004 –
Depression and fatigue may feed off each other in a vicious cycle that makes it hard to determine where one begins and the other ends, according to a study.
Researchers found people who are depressed are more than four times as likely to develop unexplained fatigue, and those who suffer from fatigue are nearly three times as likely to become depressed.
Although researchers have long suspected that depression and unexplained fatigue are related, the nature of the relationship between the two common conditions is unclear.
But the study, published in the current issue of Psychosomatic Medicine, suggests that depression and fatigue may act as independent risk factors for each other.
Depression and Fatigue Linked
In the study, researchers used information on more than 3,200 people who participated in the World Health Organization’s study of psychological problems and were monitored for one year.
Researchers found people who were depressed at the start of the study were more than four times as likely to have an episode of unexplained fatigue during that year.
In addition, those participants who were suffering from fatigue at the start of the study were nearly three times as likely to develop depression during the study.
Researchers say fatigue and the psychological disorder of depression are not the same, and the two have different risk factors. However, they may have some overlap.
“One can possibly understand how a fatigued person can start feeling psychologically distressed because of his or her condition, but the opposite is more difficult to explain,” writes researcher Pertos Skapinakis, MD, of the University of Ioannina in Greece, and colleagues.
Researchers say examining the role of physical activity may be an important factor in helping to explain the association between the two conditions in the future.
“Physical activity is known to have a protective effect on depression,” writes Skapinakis. “It has also been suggested that physical deconditioning might be an important factor in the development of unexplained fatigue.”