Bulging blood vessels on the back of the foot may be caused by local varicose veins or by venous sinus of the blood vessels on the back of the foot. Congenital abnormal vascular development, local vascular trauma and other reasons may cause varicose veins on the back of the foot, thus leading to bulging blood vessels on the back of the foot. It can be treated by local heat compress and massage to promote blood circulation and relieve clinical symptoms, and in serious cases, it can be treated by surgery, which should be able to cure it completely. The venous sinus is a normal vascular structure, which has the function of preventing venous blood backflow. If the venous sinus on the back of the foot is excessively dilated, it will form a vascular bulge on the back of the foot, which usually does not affect normal life and work and does not need to be treated. If there is a bulging blood vessel on the back of the foot, we should avoid walking and standing for a long time, and elevate the lower limbs appropriately when resting, which is conducive to blood return to the lower limbs and can relieve clinical symptoms.