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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]
The disease can further be regarded as a post-acute infection syndrome (PAIS) or an infection-associated chronic illness. [11] [26] PAISes such as long COVID and post-treatment Lyme disease syndrome share many symptoms with ME/CFS and are suspected to have a similar cause. [26] Many names have been proposed for the illness.
Signs and symptoms are also applied to physiological states outside the context of disease, as for example when referring to the signs and symptoms of pregnancy, or the symptoms of dehydration. Sometimes a disease may be present without showing any signs or symptoms when it is known as being asymptomatic . [ 13 ]
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 ...
Fatigue is often prominent in PEM symptoms, but it is "more than fatigue following a stressor". [6] Other symptoms that may occur during PEM include cognitive impairment , flu-like symptoms, pain, weakness, and trouble sleeping .
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]
The symptoms of exhaustion disorder include fatigue that does not improve with rest, [11] reduced stress tolerance and various physical symptoms. [12] Some of the more common physical symptoms are headaches, dizziness and bowel issues. Most patients also suffer from sleeping problems. [13]
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 ...