Causes of Spider Veins

Although the precise cause of spider veins is unknown, there are several factors that contribute to their development.

• Heredity – Being born with weak vein valves, is the most common factor.
• Homones – The hormonal changes that occur during puberty, pregnancy, and menopause, as well as taking estrogen, progesterone, and birth control pills can cause a woman to develop spider veins.
• Pregnancy – The circulatory system changes during pregnancy, allowing blood to flow more freely in the body, but decreasing flow from the legs to the pelvis. This change can result in enlarged veins in the legs, which may or may not improve on their own once the pregnancy is over.
• Age
• Obesity
• Leg Injury
• Prolonged Standing or Sitting
• Sun Exposure