Calf belly refers to the rear side of the calf flounder muscle and gastrocnemius muscle, synthesized into the calf triceps muscle, the small triceps soreness may be due to strenuous exercise, ligament injury, varicose veins and other reasons. 1. Strenuous exercise: it may be due to the patient’s strenuous exercise, such as running, race walking and so on. A large amount of lactic acid is produced in the calf muscles, and the accumulation of lactic acid can form a feeling of soreness as well as pain. 2. Ligament injury: the ligament connecting between two bones is more than its tolerance capacity and the injury occurs mostly due to violent trauma. Patients may experience pain, soreness and swelling around the calf muscles. 3. Varicose veins: their etiology may be related to congenital structural defects of the vein wall, acquired changes in the structure of the veins, and obstacles to venous return. Commonly found in the lower limbs, patients tend to experience soreness, discomfort and pain. Calf triceps soreness can also be seen in other causes, it is recommended that patients go to the hospital in time, follow the doctor’s instructions for treatment, to avoid delay.