Varicose veins are swollen and enlarged veins that are usually blue or dark purple. They may also be lumpy, bulging or twisted in appearance.
Varicose veins develop when the small valves inside the veins stop working properly. In a healthy vein, blood flows smoothly to the heart. The blood is prevented from flowing backwards by a series of tiny valves that open and close to let blood through. If the valves weaken or are damaged, the blood can flow backwards and can collect in the vein, eventually causing it to be varicose (swollen and enlarged).
Varicose veins are a very common condition, affecting up to three in 10 adults. Usually, women tend to be more affected than men.
Any vein in the body can become varicose, but they most commonly develop in the legs and feet, particularly in the calves. This is because standing and walking puts extra pressure on the veins in the lower body.
Some types of varicose veins are explained below.
Varicose veins are dark purple or blue in color and they are usually twisted and bulging in appearance. Some people with varicose veins do not experience any pain or discomfort, while others are more severely affected.
As well as their distinctive appearance, symptoms of varicose veins can include:
These symptoms will usually be worse during warm weather or when you have been standing up for long periods of time. Your symptoms may improve when you walk around or if you rest and raise your legs up, on some pillows (for example). Varicose veins usually develop on the legs, either on the back of your calf or on the inside of your leg. However, they can also sometimes occur in other parts of your body, such as your: