There are always risks associated with drugs. Hormonal birth control is no exception. One of those risks is developing blood clots.
Normally blood clots is the body’s way of healing itself. However, they become dangerous if they form when not needed or if they interfere with the circulatory system.
How does that tie in with birth control? Credit is generally given to estrogen found in birth control pills, patches, and rings. Estrogen doesn’t form the clots, but makes clotting more likely.
These risks are very, very low. YoungWomensHealth.org said among women who don’t take the pill, five out of 100,000 per year develop blood clots. Among women who do take the pill, the risk slightly increases to 15-20 out of 100,000 women per year.
Get this--actually being pregnant puts women at a higher risk for developing blood clots. The stats jump to 60 out of 100,000 women per year.
https://www.empowher.com/blood-clots/content/what-s-birth-control-and-risk-blood-clots