Calf pain can be caused by vascular disease, lactic acid accumulation, skeletal muscle disease and other reasons. 1. Vascular diseases: such as atherosclerosis, arterial embolism, aneurysm, varicose veins, etc., causing abnormal blood circulation in the lower limbs, which can lead to the phenomenon of calf pain. 2. Lactic acid accumulation: prolonged standing or prolonged non-exercise suddenly increase the amount of leg exercise, calf muscle lactic acid accumulation, resulting in calf soreness and swelling. 3. Skeletal muscle diseases: such as osteoarthritis of the knee joint, gastrocnemius muscle injury, flat feet and other diseases, can cause skeletal muscle pain, thus triggering the phenomenon of calf soreness and swelling. There are many reasons for this symptom, it is recommended that women with calf pain go to the hospital in a timely manner, follow the doctor’s instructions for treatment, to avoid delaying the condition.