Muscle spasms frequently occur due to the overuse of muscles through repetitive exercise or physical activity or as a result of dehydration, according to MedicineNet. Muscle spasms can also result from medical conditions... More »

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Some cause of muscle spasms are overuse or exercise of muscles on the left side, dehydration and atherosclerosis, according to MedicineNet. Nervous system disorders such as amyotrophic lateral sclerosis, multiple scleros... More »

Sleep myoclonus, restless leg disorder and periodic leg movement during sleep are sleep-related disorders that cause involuntary muscle twitches, jerks and spasms, according to the American Sleep Association. Sleep myocl... More »

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Some cause of muscle spasms are overuse or exercise of muscles on the left side, dehydration and atherosclerosis, according to MedicineNet. Nervous system disorders such as amyotrophic lateral sclerosis, multiple scleros... More »

The actual cause cramps in the legs and feet is not known, but it may be caused by conditions or activities such as overuse of muscles, dehydration, nerve compression, mineral deficiency and cold weather, according to Ma... More »

Deep muscle pain in the buttocks could be piriformis syndrome or sciatica, or could simply be a muscle spasm from exercise, states WebMD. Piriformis syndrome is a condition in which the piriformis muscle (a thin muscle l... More »

Although exercise and overuse of the muscles often causes soreness, other infections and disorders can also cause soreness, states MedlinePlus. Some other causes of muscle soreness include influenza, lupus or fibromyalgi... More »

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