The causes of calf soreness in late pregnancy include the need for adequate rest when tired, the need for calcium supplements when calcium deficiency, sleep pressure caused by appropriate massage, lower extremity venous thrombosis caused by the need to give medication, the specific need to follow the doctor’s instructions. 1. Exhaustion: due to the late stage of pregnancy, pregnant women bear more weight, when walking or standing for a long time can be due to an increase in lactic acid produced by the leg muscles and caused by calf soreness, which can be relieved after sufficient rest. 2. Calcium deficiency: As the calcium needed for fetal bone growth during pregnancy is taken from the mother, when the mother’s intake is insufficient, it will cause symptoms of calcium deficiency in the mother, which can cause calf muscle cramps, soreness, etc. Calcium can be supplemented under the guidance of the doctor and calcium-rich foods, such as dairy products, meat, eggs and so on, can be increased. 3. Sleeping compression: when sleeping in side-lying position for a long time, it can also cause calf soreness, pain and other symptoms, which can be relieved after giving proper massage. 4. Lower extremity venous thrombosis: due to pregnancy or prolonged sedentary so that the blood flow is slow, stagnation, caused by lower extremity venous thrombosis, which can be manifested as the symptoms of calf swelling, can be applied intravenously heparin, the specific need to comply with medical advice. Clinical when late pregnancy calf soreness and swelling can go to the hospital to identify the cause, and under the guidance of the doctor to give targeted treatment.