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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