What is Cramps A muscle cramp is an involuntarily and forcibly contracted muscle that does not relax. When they use the muscles that can be controlled voluntarily, such as those of our legs and arms, they alternately contract and relax as they move our limbs. A muscle that involuntarily contracts is in a "spasm." If the spasm is forceful and sustained, it becomes a cramp. It lasts for few seconds. Causes Some medicines like diurities may cause cramps. Several vitamin deficiency may directly or indirectly lead to muscle cramps. These include deficiencies of thiamine (B1), pantothenic acid (B5), and pyridoxine (B6). Poor circulation to the legs, which ends in inadequate oxygen to the muscle tissue, may cause extreme pain in the muscle that occurs with jogging or exercise.
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