There are two common reasons for ankle pain during pregnancy: first, the uterus gradually increases and rotates to one side during pregnancy, compressing the abdominal veins and preventing the venous blood flow back to the lower limbs, causing capillary water leakage from the ankle to the ankle tissue gap, resulting in increased tension in the tissue gap and compression of nerve endings, causing local pain symptoms; bed rest, changing position and lower limb elevation can reduce swelling and pain symptoms in the ankle. Secondly, during pregnancy, the weight of pregnant women gradually increases and the force on the ankle joint increases, which can gradually lead to ankle joint synovitis, which is rich in nerve endings and causes ankle joint pain after the formation of synovitis.