| ICD9 = | ICDO = | OMIM = | DiseasesDB = 30079 | MedlinePlus = 003088 | eMedicineSubj = | eMedicineTopic = | MeshID = D005221 | }}The word fatigue is used in everyday life to 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. It is ubiquitous in everyday life, but usually becomes particularly noticeable during heavy exercise. Mental fatigue, on the other hand, rather manifests in somnolence. Types Physical Fatigue Physical fatigue or muscle weakness (or "lack of strength") is a direct term for the inability to exert force with ones muscles to the degree that would be expected given the indiv

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