The causes and treatment of leg straightening are as follows: 1. The body has hypocalcemia, and the muscles are stimulated when the leg is stretched with force, triggering spasms. When hypocalcemia occurs, calcium treatment is needed, the patient does not have serious convulsions occurring at present, oral calcium or intravenous calcium treatment can be given, improve the relevant examination, find the cause of low calcium, remove the cause can correct hypocalcemia. 2, the examination should pay attention to whether there is hypomagnesemia, if so, to correct the magnesium deficiency, otherwise it is difficult to correct hypocalcemia. Hypothyroidism when the body metabolism is low, malnutrition, causing hypocalcemia, so calcium supplementation treatment at the same time should be treated hypothyroidism, correct malnutrition. 3, women are obvious calcium deficiency during menopause, and prone to osteoporosis, in addition to calcium supplementation, but also under the guidance of doctors to properly supplement estrogen. In addition to calcium supplementation, attention should also be paid to the supplementation of vitamin D3, vitamin D can promote the absorption of calcium. Eat more calcium-rich foods in daily life, pay attention to more sunshine and proper exercise to prevent calcium deficiency and osteoporosis.