The main causes of leg cramps and pains are: 1. Long-term calcium deficiency, mostly seen in children and the elderly, children are not enough intake, while the elderly are too much calcium loss. Usually appear at night lower limb cramps. Usually supplemental calcium, can significantly ease the symptoms. 2, strenuous exercise, mostly seen in athletes, long time running, lower limb muscles in a state of tension, muscle oxygen consumption increased, anaerobic enzymatic production of a large number of acidic substances, stimulating muscle muscle cramps, this pain is generally more intense. Rest or need to do muscle traction, massage to relieve the symptoms. 3, cold, visible at any age, also easy to occur at night. The cold stimulates the blood vessels causing spasm, resulting in muscle ischemia and hypoxia and cramping pain. 4, cardiovascular disease, mostly seen in the elderly, especially in the lower limbs of the arteries caused by atheromatous plaque narrowing, lower limbs of ischemia, hypoxia, causing cramps and pain.