For the middle-aged people appeared cramp symptoms: a, see the strain, because the middle-aged people engaged in heavy physical labor more, it is easy to lead to repeated muscle and fascia stress strains, causing spasm edema, and this situation in the night rest, easily lead to cramp symptoms. Second, seen in middle-aged people appear myotonic dystrophy, mainly muscle parts nutritional deficiency, resulting in muscle spasms, convulsions, which will cause the appearance of cramps symptoms, seen in middle-aged people oral medication, resulting in excessive bone calcium loss, easily caused by calcium deficiency leading to cramps.