Patients with frequent leg cramps often have the following situations: 1. Insufficient exercise, which is most common among patients who have been in bed for a long time and are very weak. Due to long-term braking, these patients have useless muscle atrophy in the lower limbs. Once you are carrying weight on the ground, or doing relatively intense activities, it may lead to repeated muscle cramps. 2. Osteoporosis is the most common among adolescents in growth and development and elderly people with severe osteoporosis. The former is due to the rapid growth and insufficient nutrition, which leads to calcium deficiency, and then muscle twitching. The latter is due to the serious bone destruction, which leads to a serious decrease in blood calcium level and then cramps. 3. The influence of old trauma in the past, such as some severe blunt contusion in the calf, leads to damage to blood vessels and nerves, which will lead to blocked blood circulation or abnormal discharge of nerves.