Calf belly pain and swelling may be due to physical factors such as strenuous exercise, prolonged standing, or consider a muscle strain, varicose veins and other diseases. 1. Physiological factors: if the patient strenuous exercise, long-term standing, may lead to muscle spasm, transient calf muscle pain and swelling. 2. Muscle strain: Muscle strain may be a direct injury, such as the muscle is subject to sudden traction caused by, or may be caused by indirect injury, such as sprinting, jumping. The patient will experience muscle pain and skin swelling, which will be manifested as calf pain and swelling. 3. Varicose veins: Varicose veins may be caused by venous reflux disorder, venous reflux, congenital developmental abnormalities and other factors. The patient will appear lower extremity skin vein bulging, lower extremity heavy, soreness, discomfort and other symptoms, manifested as calf belly pain and swelling. If the patient has calf pain and swelling, when the exclusion of physiological factors, you need to go to the regular hospital, relevant examinations, so as to identify the cause of the disease. Once diagnosed need to actively cooperate with the doctor to take treatment measures.