Medical treatment usually is not required for varicose or spider veins. However, varicose veins can become quite uncomfortable as well as look unattractive. Varicose veins usually enlarge and worsen over time. They can cause the legs and feet to swell. Although severe leg pain is not common, leg muscles may feel fatigued or heavy, or throb and cramp at night. The skin on the legs and around the ankles also can itch or burn.
In some cases, varicose veins and spider veins can cause more serious problems, and medical treatment will provide benefits. If the veins become severe, they can cause a condition called venous insufficiency, a severe clogging of the blood in the veins that prevents it from returning to the heart. This condition can cause problems like a deep-vein thrombosis (blood clot), or a severe bleeding infection. These usually are caused by injury to the varicose vein. A blood clot can be very dangerous because of the possibility of it traveling from the leg veins to the lungs, where it may block the heart and lungs from functioning. Lastly, because the skin tissue around the varicose vein may not receive enough nourishment, sores or skin ulcers may develop.