Visible veins on the feet are a mild manifestation of varicose veins, which are caused by the formation of high pressure in the veins and venous valve insufficiency, resulting in venous reflux, superficial venous tortuosity and dilatation, forming varicose veins. The majority of varicose veins are found in the feet and ankles and gradually spread upward to the calves and even the thighs, so the veins on the feet are obvious as a mild manifestation or precursor of varicose veins. The veins on the feet are more likely to be visible because poor venous reflux first involves the ankles and the tops of the feet. This is where the skin and subcutaneous tissue are weaker and the veins are more likely to be visible. The veins on the foot alone are obvious and do not need to be treated. If the condition becomes further severe and spreads to the lower leg or even the thigh, it is important to go to a specialized vascular surgery department for formal treatment.