A child crying at night with leg pain in bed is evidence of the presence of more intense leg pain that is more pronounced at night. This phenomenon can be caused by non-disease or disease factors, and can be either a common physiological phenomenon or a disease that requires ongoing treatment. When this happens, parents can take their children to the hospital for a detailed examination to clarify the cause and then target the problem. Common causes a, non-disease factors 1, excessive exercise: children walk more or longer after strenuous exercise, leg muscle lactic acid accumulation, causing leg pain, may appear to wake up at night; 2, too fast growth and development: children in the growth period, the lower limb bones grow fast, but the surrounding nerves, muscles, tendons, joint capsule growth is relatively slow, bones pull to the surrounding tissues, will produce pain, the This leads to the situation of waking up at night with leg pain. This happens mostly in the ankle, knee and hip joints, because these parts of the nerve is more dense. The calcium deficiency will lead to pain and even cramps in the calf gastrocnemius muscle, especially in the middle of the night, so it will lead to children sleeping at night and crying with leg pain; 2, fasciitis: aseptic inflammation of the calf fascia will cause pain in the calf, and the pain at night is more obvious than during the day; 3, tumors: such as bone tumors, giant cell tumor of bone, myeloma, synovial sarcoma or muscle tumors, like smooth muscle sarcoma, can cause calf pain, and the pain may be less obvious due to distraction during the day and more sensitive to pain at night; 4. Spinal diseases: such as herniated disc, lumbar spinal stenosis, slipped vertebrae, etc., may cause leg pain, which will be more obvious at night after lying down or getting cold. The incidence is lower in children. Treatment 1, children should rest more during the day when they exercise excessively, and give hot compresses to their legs at night, soak their feet in hot water or perform local massage, which can help promote lactic acid metabolism and blood circulation, thus relieving leg pain; 2, children’s growing bodies have a high demand for calcium, so they should pay attention to calcium supplementation and reduce the amount of exercise appropriately. Usually you can eat more calcium-rich foods such as milk, soy products, shrimp, seaweed, deep-sea fish and other calcium-rich foods to supplement calcium, pay attention to nutritional balance, do not picky food. In addition, you can also go outdoors more in the sun to help promote calcium absorption; 3. If there is sterile inflammation, anti-inflammatory treatment such as diclofenac and glucocorticoids can be given, rehabilitation treatment for spinal diseases and surgery if necessary, and radiotherapy or surgical removal for tumor diseases.