Symptoms Cramps are sudden involuntary forced muscle contractions that cause muscle stiffness and pain. It usually occurs suddenly and violently, but does not last long, only a few minutes. First aid 1. The patient can be helped to massage or pull the affected muscle to relieve the pain. Repeat the pulling until the symptoms are relieved. 2.After the cramp is relieved, if there is still pain, use a hot water bag or hot towel locally, or take a hot bath. 3, change to lying to sitting, straighten the cramped leg, hold the forefoot with your hand and rotate the ankle joint of the cramped leg to the outside with severe pain, the severe pain will stop immediately. Note 1: Pay attention to your diet and keep warm. Eat more meat, eggs, sweets, and moderate intake of fat and protein to increase body heat, which can effectively reduce cramps. 2, avoid swimming in hunger, fatigue. When you are hungry and fatigued, you are prone to hypoglycemia, and when you swim in a state of hypoglycemia or fatigue, cramps can occur when your muscles encounter the stimulation of cold water. 3, if cramps continue to occur for unknown reasons, it is necessary to go to the hospital for examination to find out the underlying causes.