Leg cramps, medically known as painful leg cramps, manifest as sudden, violent, involuntary contractions of one or more groups of muscles in the legs. Although the cramp lasts only a few minutes, the discomfort or tenderness in the muscle can last for hours after the episode. The most common clinical condition is gastrocnemius cramp in elderly people, and it often occurs at night when they are asleep, and continuous attacks can affect sleep and reduce the quality of life. It is widely believed that leg cramps are caused by a lack of calcium in the body, but this is not entirely true. It has been found that a significant number of elderly people have cramps even after calcium supplementation. Most of the nocturnal leg cramps seen in clinical practice are idiopathic. Most of them are caused by the body’s meridians, poor qi and blood flow or malabsorption. However, the probability of leg cramps increases when suffering from certain diseases, called secondary leg cramps, such as multiple muscle diseases, peripheral neuropathy, anemia, uremia, diabetes, heart disease, thyroid disease, low magnesium, low calcium, low potassium, etc. In addition, taking certain medications such as hormones, morphine, cimetidine, diuretics for lowering blood pressure, nifedipine, statins for lowering cholesterol, and lithium salts for psychiatric use can also induce secondary leg cramps. To prevent leg cramps, older adults should do the following in their daily lives: 1. Wear comfortable shoes. Flat feet and other body composition problems make some people especially prone to leg cramps. Properly fitting shoes are one way to compensate. 2. Pull the bedding loose. Many people like to sleep with the blanket covered tightly, especially when lying on their backs, the blanket may press the foot, so that the gastrocnemius and plantar muscles are tight, and cramps can easily occur. Just pull the bedding loose some. 3. Stretch the muscles. Stretching the gastrocnemius and foot muscles before going to bed can help prevent cramps in the first place. You can also place the front of the foot on the first step of the stair tread and slowly press down on the heel so that the heel position is lower than the step position. 4, press and rub acupuncture points. Every morning and evening, press and rub the Shangqiu point (on the inner side of the foot, in the depression below the front of the inner ankle) and the Diji point (on the inside of the calf, about 5 inches below the knee, the inner posterior edge of the tibia) for 3 to 5 minutes each for 3 to 5 days. It can strengthen the spleen, promote absorption, and promote transportation, which helps prevent leg cramps. 5, pay attention to lifestyle. Avoid drinking alcohol, coffee and cola and other beverages with excitatory central nervous system effects before sleep, do not read books with refreshing effects, do not watch stimulating film and television programs, and avoid emotional excitement.