Spider veins can occur even if you’re young but some people are more likely than others to develop spider veins. Hormonal fluctuations, particularly during pregnancy or while taking birth control pills or other hormonal therapies, can play a role which is why women are more commonly affected than men.
Hormones, such as oestrogen and progesterone, are known to relax vein walls and make them more susceptible to damage. During pregnancy, blood is also pumping through the body at a higher than normal rate, which may cause veins to swell.
Other risk factors include:
- A family history of spider veins
- Sitting or standing for long periods of time
- Being overweight or obese
- The normal ageing process
- Having blood clots or other conditions