There are many reasons for leg cramps, such as physiological factors, calcium deficiency, vascular lesions in the lower limbs, lumbar intervertebral disc herniation, neurological disorders and so on. 1. Physiological factors: incorrect sleeping position at night, overwork, excessive exercise, pregnancy, cold stimulation, etc., may lead to leg cramps, which is a physiological phenomenon. 2. Calcium deficiency: Calcium deficiency will lead to a decrease in the concentration of calcium in the blood, resulting in a decrease in the inhibitory state of the nerves in the legs, thus causing muscle spasms and leading to leg cramps. 3. Lower extremity vascular disease: lower extremity venous thrombosis, lower extremity varicose veins and other diseases can also induce leg cramps. 4. Herniated lumbar intervertebral disc: Herniated lumbar intervertebral disc can lead to peripheral nerve compression, which can lead to leg cramps, leg numbness, pain and other symptoms. 5. Neurological disorders: Tourette’s syndrome, epilepsy, motor neuron disease, peripheral neuropathy, etc. can also lead to leg cramps. The causes of leg cramps are very many, the phenomenon should go to the hospital in a timely manner to improve the examination, to take targeted treatment, do not ignore the symptoms, take it lightly, so as not to lead to adverse consequences.