A varicose vein is a condition caused by thin or damaged vein walls and valves. They may form whenever blood pressure increases inside your veins. Many reasons these occur can be pregnancy, constipation, a tumor, or being overweight and obese. The most common signs of varicose veins are in the legs, but sometimes varicose veins form in other parts of the body. Different Types of Varicose Veins Another type of varicose vein are hemorrhoids that originate in the rectum. Varicoceles