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Prolonged fatigue is fatigue that persists for more than a month, and chronic fatigue is fatigue that lasts at least six consecutive months, which may be caused by a physical or psychological illness, or may be idiopathic (no known cause). [1] Chronic fatigue with a known cause is twice as common as idiopathic chronic fatigue. [6]
Fatigue in a medical context is used to cover experiences of low energy that are not caused by normal life. [2] [3]A 2021 review proposed a definition for fatigue as a starting point for discussion: "A multi-dimensional phenomenon in which the biophysiological, cognitive, motivational and emotional state of the body is affected resulting in significant impairment of the individual's ability to ...
The fatigue experienced in ME/CFS is of a longer duration and greater severity than in other conditions characterized by fatigue. [10]: 5–6 The hallmark feature of ME/CFS is a worsening of symptoms after exertion, known as post-exertional malaise or post-exertional symptom exacerbation. [6] PEM involves increased fatigue and is disabling.
Lethargy is a state of tiredness, sleepiness, weariness, fatigue, sluggishness, or lack of energy. It can be accompanied by depression , decreased motivation, or apathy . Lethargy can be a normal response to inadequate sleep, overexertion, overworking, stress, lack of exercise, improper nutrition, drug abuse, boredom , or a symptom of an ...
Despite ample evidence that ME/CFS is an organic disease, many clinicians do not recognise it as genuine or underestimate its seriousness. [6] [1] [4] A 2020 literature review found that “a third to a half of all GPs did not accept ME/CFS as a genuine clinical entity and, even when they did, they lacked confidence in diagnosing or managing it.” [4]
The name Chronic Fatigue Syndrome has been attributed to the US Centers for Disease Control 1988 research case definition for the illness, "Chronic fatigue syndrome: a working case definition". [ 38 ] [ 40 ] Chronic Fatigue Syndrome (CFS) was added to ICD-9 after 1988 and listed under code 780.71 , Symptoms Signs and Ill-defined Conditions.
Central nervous system fatigue, or central fatigue, is a form of fatigue that is associated with changes in the synaptic concentration of neurotransmitters within the central nervous system (CNS; including the brain and spinal cord) which affects exercise performance and muscle function and cannot be explained by peripheral factors that affect muscle function.
Fatigue may also refer to: Medical. Central nervous system fatigue, changes in the synaptic concentration of neurotransmitters which affects exercise performance and muscle function Synaptic fatigue; Chronic fatigue, long-term fatigue that limits a person's energy or ability to carry out daily activities, also known as central fatigue