Calf tummy pain at night in the 5th month of pregnancy may be caused by calcium deficiency, exertion, venous thrombosis of the lower limbs, etc. According to the specific situation, give calcium supplementation, rest, local massage, elevation of the lower limbs and other treatments. 1. Calcium deficiency: due to the growth and development of the fetus, pregnant women have an increased need for calcium. Pregnant women who do not supplement calcium and vitamin D in a timely manner are prone to calcium deficiency, which causes muscle spasms in the lower limbs and leads to calf tummy pain in pregnant women. Pregnant women drink more milk, appropriate oral calcium gluconate and other drugs, calf stomach pain can be significantly relieved. 2. Exhaustion: After pregnancy, the center of gravity of pregnant women shifts forward due to the increase of the uterus, and the weight of the lower limbs increases. Pregnant women are too tired during the day, especially wearing high heels walking, can lead to pregnant women calf tummy pain. Attention should be paid to bed rest, local massage to promote blood circulation, pregnant women calf tummy pain symptoms can be relieved. 3. Lower extremity venous thrombosis: after pregnancy, the lower extremity circulation slows down, the blood is hypercoagulable, which can cause lower extremity venous thrombosis, resulting in pain in the lower extremities of pregnant women. Bed rest, elevate the lower limbs, and wear compression stockings if necessary can relieve lower limb pain. Calf pain in the fifth month of pregnancy should be timely consultation, under the guidance of the doctor to identify the cause of the disease, give appropriate treatment.