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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]
Post-exertional malaise (PEM), sometimes referred to as post-exertional symptom exacerbation (PESE) [1] or post-exertional neuroimmune exhaustion (PENE), [2] is a worsening of symptoms that occurs after minimal exertion.
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 ...
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]
A mildly depressed level of consciousness or alertness may be classed as lethargy; someone in this state can be aroused with little difficulty. [1] People who are obtunded have a more depressed level of consciousness and cannot be fully aroused. [1] [2] Those who are not able to be aroused from a sleep-like state are said to be stuporous.
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.
Somnolence (alternatively sleepiness or drowsiness) is a state of strong desire for sleep, or sleeping for unusually long periods (compare hypersomnia).It has distinct meanings and causes.