The main reason for the cramps in the thighs: 1, the common cause is the calcium deficiency, which causes the muscles to be excited, triggering the cramps in the thighs or calves. 2, there is also a local infection, stimulating the surrounding muscle tissue or nerve tissue, which causes the feeling of cramps in the thighs. 3, lumbar disc protrusion, the prolapsed disc compresses the surrounding nerve roots and triggers a series of symptoms, including leg cramps. 4, there is also because of strenuous activity or fatigue, or the environment is relatively low temperature, resulting in short-term discomfort and the appearance of thigh cramps. If the cause is clear and there is no relief after the above treatment, you must go to a regular hospital in time to avoid delaying the condition.