Varicose veins are a common condition, affecting up to 3 in 10 adults. Read more about the causes of varicose veins. If the valves weaken or are damaged, the blood can flow backwards and collect in the vein, eventually causing it to be swollen and enlarged (varicose).Ĭertain things can increase your chances of developing varicose veins, such as: The blood is prevented from flowing backwards by a series of tiny valves that open and close to let blood through. In a healthy vein, blood flows smoothly to the heart. Varicose veins develop when the small valves inside the veins stop working properly. Read more about diagnosing varicose veins. Your GP can diagnose varicose veins based on these symptoms, although further tests may be carried out. Read more about the symptoms of varicose veins. dry skin and colour changes in the lower leg.They may also be lumpy, bulging or twisted in appearance. Varicose veins are swollen and enlarged veins – usually blue or dark purple – that usually occur on the legs.
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