Lack of strength; Muscle weakness
A reduction in the strength of one or more muscles.
Weakness is a very important symptom. The feeling of weakness may be subjective (the person feels weak but has no measurable loss of strength) or concrete (measurable loss of strength). Weakness may be generalized (total body weakness) or localized to a specific area, side of the body, limb, and so on.
A subjective feeling of weakness usually is generalized and associated with infectious diseases such as infectious mononucleosis and influenza.
Weakness is particularly important when it occurs in only one area of the body (localized or focal weakness). Localized weakness may follow a stroke, exacerbation of multiple sclerosis, or trauma to a motor nerve root or peripheral nerve.
Measurable weakness may result from a variety of conditions including metabolic, neurologic, primary muscular diseases, and toxic disorders.
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