The causes for these vessels are many, and in any given person, more than one factor may be playing a role in causing varicose and spider veins. The major factors causing varicose veins on the legs are:
- Genetic: In these cases, there is usually a strong family history, including an affected mother, sister(s) and/or daughter(s).
- Hormonal:There is frequently a worsening during times of heightened estrogen levels, as during pregnancy, during adolescence, or while taking some estrogen-containing medication (such as birth control pills).
- Physical trauma:There is usually a history of a well remembered blow, or fall, or cut, or surgical procedure at or near the affected sight.
Other factors are known as causes, but are much less commonly associated with the veins than the three factors listed above.