The following are the main causes of leg cramps in the elderly: 1. calcium deficiency, as the bone mass changes with age, it is easy to have low calcium and osteoporosis. 2. vascular lesions in the lower extremities of the elderly lead to insufficient blood supply, which can cause cramps. 3. external cold stimulation makes muscle regulation unstable, which can cause cramps. 4. cerebral vascular lesions, impaired regulation of the movement of the dominant limb can also occur. 5. lesions of the lumbar intervertebral discs, which compress the sciatic nerve, can also cause cramps. The symptoms of cramps can also occur due to compression of the sciatic nerve. Patients can increase meat, eggs, fish and dairy foods, supplement calcium tablets with vitamin D3, and get more sunlight. Patients with vascular lesions in the lower extremities can take oral anticoagulant and lipid-regulating drugs. If symptoms are not relieved, a hospital visit can be made to rule out cerebrovascular and spinal lesions.