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The fatigue must have lasted for 6 months or longer, and be present at least 50% of the time; Other symptoms are possible, such as muscle pain, mood problems, or sleep disturbance; Conditions known to cause severe fatigue and some mental conditions exclude a diagnosis. Post-infectious fatigue syndrome also requires evidence of a prior infection ...
Chronic fatigue with a known cause is twice as common as idiopathic chronic fatigue. [6] Idiopathic chronic fatigue affects between 2.4% and 6.42% of patients, [26] with females more likely to be affected than men. [1] Age at onset is typically over 50 years of age. [13]
People suffered from "chronic or recurrent fatigue", among a large number of other symptoms. [1]: 28–29 The initial link between elevated antibodies and the Epstein–Barr virus led to the name "chronic Epstein–Barr virus syndrome". The CDC renamed it chronic fatigue syndrome (CFS), as a viral cause could not be confirmed in studies.
Fatigue is a state of tiredness (which is not sleepiness), exhaustion [1] or loss of energy. [2] [3]Fatigue (in the medical sense) is sometimes associated with medical conditions including autoimmune disease, organ failure, chronic pain conditions, mood disorders, heart disease, infectious diseases, and post-infectious-disease states. [4]
An adult who is compelled to nap repeatedly during the day may have excessive daytime sleepiness (EDS); however, it is important to distinguish between occasional daytime sleepiness and EDS, which is chronic. A number of tools for screening for EDS have been developed.
The Canadian Consensus Criteria require "post exertional malaise and/or [post exertional] fatigue" instead. [21] [22] [23] [19] [24] On the other hand, the older Oxford Criteria lack any mention of PEM, [25] and the Fukuda Criteria consider it optional. Depending on the definition of ME/CFS used, PEM is present in 60 to 100% of ME/CFS patients.
Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) and fibromyalgia can also be associated with hypersomnia. The CDC states that people with ME/CFS experience post-exertional malaise, fatigue, and sleep problems (among other symptoms). [19] Polysomnography shows reduced sleep efficiency and may include alpha intrusion into sleep EEG.
However, if the sleepless pattern persists without external factors, it may lead to chronic sleep issues. Chronic sleep deprivation occurs when a person routinely sleeps less than the amount required for proper functioning. The amount of sleep needed can depend on sleep quality, age, pregnancy, and level of sleep deprivation.