While no one knows exactly or with certainty what causes varicose and spider veins, we do know that a number of factors can increase the likelihood of developing leg vein problems. We also know that the primary factor contributing to the development of varicose and spider veins is heredity or the genetic predisposition to weak vein walls and vein valves resulting in leg vein problems.
There are also a number of lifestyle variables known to accelerate and aggravate the development of varicose or spider veins:
- Birth Control Pills
- Hormone Replacement Therapies
- Lack of Exercise
- Prolonged Sitting or Standing
Spider veins often occur in conjunction with varicose veins due to increased venous pressure. They also develop on their own due to an increased number of shunts, or microscopic short-cuts, connecting the venous and arterial systems.