Postpartum calf soreness is mainly caused by the following reasons: First, it may be caused by overworked calf muscles. During the process of giving birth, the patient needs to keep exerting force, and the muscles of the patient’s whole body will be under constant tension, especially the muscles in the calf area. The soreness and swelling may be caused by overworking of the muscles here after delivery. Second, it may be caused by cold in the calf area. For example, during childbirth, the patient was exposed to cold for a long period of time, resulting in muscle spasm or sterile inflammation, which can cause soreness and swelling here. In the postpartum period, many mothers need to stay in bed for a long time, when the resistance is poor, once the calf area is cooled, it will also cause sterile inflammation here, resulting in soreness and swelling. Third, it may be caused by the venous thrombosis of the lower limbs. After giving birth, the mother needs to stay in bed for a long time, resulting in the blood circulation of the lower limbs becoming very slow, which may produce thrombosis inside the veins of the lower limbs, resulting in severe swelling of the lower limbs, with a feeling of soreness and pain. Fourth, it may be caused by the lack of muscle strength of the lower limbs. Postpartum mothers are very weak, the muscle strength of the lower leg may be insufficient, and the weight-bearing activities on the ground may not be strong enough, producing excessive muscle fatigue and soreness.