What is Fatigue?

While the concept of fatigue seems obvious in everyday usage, there are several medical definitions of the term. Specialists in the field note that fatigue is multidimensional and may include:

	Physical fatigue, which refers to unusual tiredness after physical exertion;
	Mental fatigue, which is difficulty focusing on activities that require concentration;
	Motivational fatigue, which is defined as a lack of will or desire to engage in emotional or physical activities.

There are also acute and chronic types of fatigue. Acute fatigue is generally short-lived, sudden in onset, and relieved by rest. Chronic fatigue lasts a long time (usually six months or longer), may be insidious in onset, and is usually not relieved by rest.

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