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Fatigue (medical)




  Name Fatigue
  ICD10
  ICD9
  ICDO
  OMIM
  DiseasesDB 30079
  MedlinePlus 003088
  EMedicineSubj
  EMedicineTopic
  MeshID D005221


The word ''fatigue'' is used in everyday living 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 abilities123. It is in everyday life, but usually becomes particularly noticeable during heavy Exercise . Mental fatigue, on the other hand, rather manifests in Somnolence .


TYPES



Physical fatigue

See Also: Muscle weakness


Physical fatigue or muscle weakness (or "lack of strength") is a direct term for the inability to exert force with ones Muscle s to the degree that would be expected given the individual's general Physical Fitness . A test of strength is often used during a Diagnosis of a muscular disorder before the Etiology can be identified. Such etiology depends on the type of muscle weakness, which can be true or perceived as well as central or peripheral. True weakness is substantial, while perceived rather is a sensation of having to pur more effort to do the same task. On the other hand, central muscle weakness is an overall exhaustion of the whole body, while peripheral weakness is an exhaustion of individual muscles.


Mental fatigue

See Also: Somnolence


In addition to physical, fatigue also includes mental fatigue, not necessarily including any muscle fatigue. Such a mental fatigue, in turn, can manifest itself both as Somnolence (decreased Wakefulness ) or just as a general decrease of Attention , not necessarily including sleepiness. In any case, this can be dangerous when performing tasks that require constant concentration, such as driving a Vehicle . For instance, when a person is sufficiently somnolent, he or she may experience Microsleeps . However, objective cognitive testing should be done to differentiate the neurocognitive deficits of brain disease from those attributable to tiredness.


CAUSES

Fatigue is typically the result of Work ing, mental Stress , Jet Lag or active Recreation , and also Boredom , Disease and Lack Of Sleep . It may also have chemical causes, such as Poison ing or Mineral or Vitamin deficiencies.

The sense of fatigue is believed to originate in the functions plus parts of the brain evolve and function together in a unitary way.5


Diseases

Temporary fatigue is likely to be e.g. Common Cold . Chronic fatigue, on the other hand, meaning of six months or more duration, is a symptom of nearly 30 different diseases.



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