Hormonal Birth Control: Risk of Blood Clots
In some women, the estrogen in combination hormonal birth control methods increases the risk of a blood clot in a leg (deep vein thrombosis, or DVT) or a blood clot in a lung (pulmonary embolism, or PE). A blood clot in a leg vein can travel through the circulation system and cause pulmonary embolism.
The risk for DVT or PE is overall very low with hormonal contraceptives. In the past, combination birth control pills contained a higher dose of estrogen, which increased the risk of DVT and PE. Now the combination pill contains a lower dose of estrogen, and the risk is reduced. The risk for DVT or PE is actually higher for a pregnant women than for nonpregnant women taking hormonal contraceptives.
Combination hormonal contraceptives that contain the progestin called desogestrel increase the risk of DVT or PE more than contraceptives that contain other types of progestin.
The birth control patch delivers more estrogen than the low-dose birth control pills do. The U.S. Food and Drug Administration (FDA) warns that women using the patch are slightly more likely to get dangerous blood clots in the legs and lungs than women using birth control pills. So talk to your doctor about your risks before using the patch.
The known risk factors for blood clots (DVT or PE) include:1
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