Are varicose veins and spider veins dangerous?

Spider veins rarely are a serious health problem, but they can cause uncomfortable feelings in the legs. If there are symptoms from spider veins, most often they will be itching or burning. Less often, spider veins can be a sign of blood backup deeper inside that you can’t see on the skin. If so, you could have the same symptoms you would have with varicose veins.

Varicose veins may not cause any problems, or they may cause aching pain, throbbing, and discomfort. In some cases, varicose veins can lead to more serious health problems. These include:

• Sores or skin ulcers due to chronic (long-term) backing up of blood. These sores or ulcers are painful and hard to heal. Sometimes they cannot heal until the backward blood flow in the vein is repaired.
• Bleeding. The skin over the veins becomes thin and easily injured. When an injury occurs, there can be significant blood loss.
• Superficial thrombophlebitis (throm-bo-fli-BYT-uhs), which is a blood clot that forms in a vein just below the skin. Symptoms include skin redness; a firm, tender, warm vein; and sometimes pain and swelling.
• Deep vein thrombosis, which is a blood clot in a deeper vein. It can cause a “pulling” feeling in the calf, pain, warmth, redness, and swelling. However, sometimes it causes no significant symptoms. If the blood clot travels to the lungs, it can be fatal.