The causes of thigh muscle cramps are: First, after strenuous exercise or excessive exercise, cold, resulting in forced muscle contraction, spasm, you can rest, massage, hot compresses and other treatment. Second, hypocalcemia, low calcium when the neuromuscular junction excitement sexy, easy to appear leg cramps, it is recommended that calcium supplementation treatment, oral calcium tablets or cod liver oil. Third, other atypical, uncommon causes include seizures, thigh muscle spasms, irregular seizures, recurrent seizures, consider the possibility of epilepsy, you can do EEG, head MRI, etc. Fourth, some neuritis, including lumbar disc herniation compressing nerve roots appears thigh muscle spasm, numbness, pain and other symptoms, you can check the lumbar spine film or MRI to clarify the cause and diagnosis. Fifth, other injuries including trauma can also appear, including thigh sprains, local pulling appears muscle spasm.