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	Other Names
	Chronic Fatigue Syndrome, Chronic Fatigue, CFS, Fatigued, Tired, Tiredness, Lethargy, Lethargic, Exhausted, Exhaustion, Lack of Energy, Deficient Constitutions. View products
	Fatigue, or tiredness, is a physiological state in which muscles become fatigued by the lactic acid accumulating in them as the result of their activity. For the removal of lactic acid in the recovery phase of muscular contraction oxygen is needed. If the supply of oxygen is not plentiful enough, or cannot keep pace with the work the muscle is doing, then lactic acid accumulates and fatigue results. There is also a nervous element in muscular fatigue: it is diminished by stimulation of the sympathetic nervous system. Chronic fatigue is a symptom of some illnesses such as anaemia, hypothyroidism mononucleosis, motor neurone disease, myasthenia gravis, myalgic encephalitis (me) and others. Some drugs may also produce a feeling of fatigue. View products