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Weakness and fatigue are terms that are often interchanged but in fact describe two different sensations. Weakness is a lack of physical or muscle strength and the feeling that extra effort is needed to perform daily activities that require you to move your arms, legs, or other muscles. General weakness often occurs after you have overexerted yourself, such as by taking an extra-long hike. Rarely, generalized muscle weakness may be caused by another health problem, such as:- Hypothyroidism or hyperthyroidism
- Guillain-Barré syndrome
- Myasthenia gravis
Sudden muscle weakness and loss of function in one area of the body can indicate a serious problem within the brain (such as a stroke or transient ischemic attack) or spinal cord or with a specific nerve in the body.
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