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Most of the time, no apparent cause for night leg cramps can be identified. In general, night leg cramps are likely to be related to muscle fatigue and nerve problems. The risk of having night leg cramps increases with age. Pregnant women also have a higher likelihood of having night leg cramps. Several conditions, such as kidney failure and diabetic nerve damage, are known to cause night leg cramps. But if you have one of these, you're most likely aware of it and have symptoms other than night leg cramps.
Fasciculation (Muscle Twitch). Fasciculation, or muscle twitching, is involuntary movement of the muscles in an area of your body. Common areas for spasms or tremors to occur include the eyelid, calf or thumb. Muscle spasm causes range from stress to neurological problems.ertain drugs, such as diuretics, corticosteroids or estrogens may have also cause muscle twitching as a side effect. Because the most common causes of muscle twitching are stress or strenuous exercise, you may experience occasional muscle fasciculation if you are an athlete.