Fatigue (also called exhaustion, lethargy, languidness, languor, lassitude, and listlessness) is a state of awareness. It can describe a range of afflictions, varying from a general state of lethargy to a specific work-induced burning sensation within one's muscles. It can be both physical and mental. Physical fatigue is the inability to continue functioning at the level of one's normal abilities.[1][2][3] It is ubiquitous in everyday life, but usually becomes particularly noticeable during heavy exercise Physical exercise is any bodily activity that enhances or maintains physical fitness and overall health. It is performed for many different reasons. These include strengthening muscles and the cardiovascular system, honing athletic skills, weight loss or maintenance and for enjoyment. Frequent and regular physical exercise boosts the immune system,. Mental fatigue, on the other hand, rather manifests in somnolence Somnolence is a state of near-sleep, a strong desire for sleep, or sleeping for unusually long periods (c.f. hypersomnia). It has two distinct meanings, referring both to the usual state preceding falling asleep, and the chronic condition referring to being in that state independent of a circadian rhythm. The disorder characterized by the latter.
Fatigue is considered a symptom A symptom is a departure from normal function or feeling which is noticed by a patient, indicating the presence of disease or abnormality. A symptom is subjective, observed by the patient, and not measured, as opposed to a medical sign A medical sign is an objective indication of some medical fact or characteristic that may be detected by a physician during a physical examination of a patient, because it is reported by the patient instead of being observed by others. Fatigue and ‘feelings of fatigue’ are often confused.[4]
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