For many people, varicose veins are simply a cosmetic concern. However, for others, they can cause aching pain, discomfort, and other symptoms. Commonly reported symptoms include a dull ache, throbbing, itching, cramping, and a feeling of heaviness in the legs. Varicose veins can also cause swelling, skin discoloration, and ulcers if left untreated. Leg pain due to varicose veins can also affect quality of sleep. Varicose veins are a sign of underlying vein disease or venous insufficiency, which occurs when vein valves malfunction and cause blood to pool. In addition to pain, varicose veins can also increase the risk of developing deep vein thrombosis or a pulmonary embolism, which can cause leg pain and swelling and is a serious medical condition.