Running day after day, it is a shame to stop running, and there is a constant pursuit of running results. Health is no longer the main goal, and performance and ability are considered as the driving force for running. When your running state reaches this level, please pay attention: calf pain is not far from you. Leg pain caused by running is generally manifested in the front or lateral pain of one leg or both legs. Usually it hurts when you exercise, but it is obviously relieved or painless when you rest. Sometimes the pain or tenderness will extend to your knees. Most of the causes of leg pain are that the amount of running exercise increases too fast, without gradual progress, which leads to long-term tension of leg muscles and continuous muscle involvement, resulting in tearing injury of tibia and fibula membrane, periosteum, periosteum vascular dilatation, congestion, edema or bleeding, and periosteum hyperplasia. This kind of leg pain is called fatigue periostitis of tibia and fibula. In severe cases, there is localized swelling on the inside of the calf or above the ankle joint, burning sensation in the skin, weakness in the back pedal, severe pain and difficulty in walking. The pain of backing out is a unique symptom of this pain. When the toe is pushed back, the calf feels pain. In addition, due to the hard ground, incorrect landing action and lack of buffer, the calf will be subjected to greater reaction force, resulting in calf pain. In order to prevent calf pain, runners should follow the principle of step by step when exercising, and should not rush for success. Do a good job of preparation before exercise, stretch gastrocnemius and soleus muscles to enhance the adaptability of calf, don't suddenly increase the amount of exercise, don't do strength training directly without preparation, and try to avoid exercising in too hard and uneven areas. Running shoes should have certain cushioning performance, pay attention to relaxation when running and cushioning when landing. Don't worry after the onset of fatigue periostitis. As long as you reduce the movement of your lower limbs (it is not good to stop completely), you can relax and jog on the grass. After running, you can apply ice, gradually adapt to it, and you can heal yourself in about two weeks. After returning home, you can bathe your calf with warm water of about 50 degrees for about half an hour each time, which has a good effect on relieving inflammatory reaction. Those with severe leg pain and small nodules or lumps can also be treated by physical therapy, massage, acupuncture and local injection of procaine. You can stop running. The injured calf can be fixed with elastic bandage for two weeks. Be careful not to rub the pain point inside the calf with heavy hands when the pain occurs, which will stimulate the periosteum to cause reactive thickening and prolong the healing time. In addition, if you run fast after the onset of pain, under the continuous stimulation of this external force, the periosteum will be damaged, which may eventually lead to fatigue fracture. Different from fatigue fracture, fatigue periostitis only feels pain when carrying out weight-bearing activities (walking and climbing stairs). Finally, when the leg hurts, you can also do some alternative exercises, which is conducive to the rapid recovery of the pain. The best alternative exercise is swimming and cycling with less leg load, which can exercise cardiopulmonary function and endurance and help runners maintain good physical condition during injury.