Soreness in the calf muscles on both sides is a relatively common symptom in the clinic, and the main causes include the following: 1. It is possible that the muscle pulling pain is caused by too much activity or too much walking. Due to the amount of exercise or some work environments require long periods of standing, resulting in a large amount of lactic acid produced by the muscles. After resting, the lactic acid discharge is restricted, and it is easy to form soreness in the muscles. 2, some lower limb vascular lesions, such as varicose veins or some thrombosis formation, can lead to soreness in the calf muscles. 3, due to lumbar vertebrae or herniated discs compressing nerves, resulting in some swelling, soreness, or even numbness in the calf skin, or outer ankle. Therefore, if you have symptoms of calf muscle pain, it is best to go to a regular hospital for a detailed examination to find the exact cause of the disease and to carry out systematic treatment for the cause.