Veins are the vessels that carry blood from your body back to your heart. Special valves inside healthy veins make sure that blood moves toward your heart and does not flow in the wrong direction. When these valves do not work properly, you experience symptoms, including:
- Spider veins: These are small, thin and winding veins that look like little threads at the surface of your skin. They are often red, purple and blue in color.
- Varicose veins: These veins appear swollen and twisted and often push up under your skin.
- Deep vein thrombosis (DVT): This condition is the development of blood clots in veins in the leg or pelvic area.
- Pulmonary embolism (PE): The most serious complication of DVT, PE occurs when a clot breaks free from an artery and lodges in your lungs. PE can cause your heart and lungs to collapse, which is very dangerous.
- Chronic venous insufficiency (CVI): This is a condition in which blood in the legs does not flow back correctly to the heart due to problems with the valves in the veins.