muscle cramps are sudden, involuntary contractions in your muscles. they often occur after exercise or at night, lasting a few seconds to several minutes. you have probably had a muscle cramp before. muscle cramps can be caused by nerves that fail to work normally. sometimes this failure is due to a health problem, such as a spinal cord injury or a pinched nerve in the neck or back. other causes are straining or overusing a muscle and a lack of minerals in your diet or the reduction of minerals in your body. cramps can be very painful, and stretching or gently massaging the muscle can relieve this pain.
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