Yes, combined birth control pills can raise blood pressure. The increase is usually small for most women, but current users have roughly 1.8 times the risk of developing high blood pressure compared to women who have never taken the pill. The good news: the effect is typically reversible after stopping.
How Much the Pill Raises Blood Pressure
For the average woman under 35, combined oral contraceptives raise systolic blood pressure (the top number) by about 1.5 mmHg and diastolic (the bottom number) by about 1.0 mmHg. That’s a subtle shift most people would never notice. Women between 35 and 45 see a larger bump, around 3.5 mmHg systolic and 2.0 mmHg diastolic. A large U.S. study of over 68,000 women found average increases of 0.7 mmHg systolic and 0.4 mmHg diastolic across the board.
These are averages, though, and they mask a wide range of individual responses. About 5% of women who used older, high-dose formulations developed full-blown hypertension. Modern pills contain significantly less estrogen, so the rate is lower today. Still, in one major prospective study tracking over 231,000 person-years, roughly 41.5 extra cases of hypertension per 10,000 person-years were directly attributable to pill use. That translates to a real but relatively uncommon problem.
Why the Pill Affects Blood Pressure
The estrogen in combined pills triggers your liver to produce more of a protein called angiotensinogen. That protein kicks off a hormonal chain reaction that causes blood vessels to constrict and signals your kidneys to hold onto more sodium and water. The net result is higher blood volume pushing through narrower vessels, which means higher pressure.
There’s also evidence that birth control pills interfere with how your nervous system regulates blood vessel tone and may increase the release of a hormone that causes your body to retain water. These effects layer on top of each other, which is why some women are more affected than others depending on their individual biology.
Who Is Most at Risk
Several factors make a blood pressure increase more likely or more pronounced:
- Age over 35 to 45: Blood vessels naturally become stiffer with age, and the estrogen-driven pressure increase compounds this. Women over 45 see systolic readings about 3.5 mmHg higher than younger users on the same pills.
- BMI over 30: Estrogen accumulates in fat tissue, which amplifies the hormonal cascade that raises blood pressure. Women with obesity have a 35% higher risk of developing hypertension on the pill compared to women at a lower weight.
- Pre-existing high blood pressure: If your blood pressure is already elevated, the pill’s effects stack on top of an existing problem. This is the single biggest risk factor.
- Family history: A family history of hypertension, along with smoking and existing cardiovascular disease, all act as additional contributors.
- Duration of use: Longer use is associated with a greater cumulative effect on blood pressure.
What the Guidelines Say
The CDC’s 2024 contraceptive recommendations are clear: blood pressure should be checked before starting combined hormonal contraceptives. If your readings are at or above 160/100, combined pills are considered unsafe. If your blood pressure falls in the 140 to 159 systolic or 90 to 99 diastolic range, combined pills are generally not recommended either, though the restriction is slightly less absolute.
These cutoffs exist because poorly controlled high blood pressure in pill users carries serious cardiovascular consequences. The combination is associated with roughly three times the risk of heart attack and ischemic stroke, and the risk of hemorrhagic stroke (a bleed in the brain) rises as much as 15-fold. These are rare events in young women overall, but the stakes are high enough that screening matters.
Progestin-Only Pills Are Different
The blood pressure effect comes primarily from estrogen, not progestin. Progestin-only pills (sometimes called the mini-pill) don’t carry the same risk. The CDC classifies blood pressure screening as a “Class C” consideration for progestin-only pills, meaning it doesn’t substantially affect their safe use. Women with hypertension can use progestin-only pills safely according to current medical eligibility criteria. Other non-estrogen options like hormonal IUDs and the implant also sidestep this issue.
Blood Pressure After Stopping the Pill
If the pill is raising your blood pressure, stopping it works. One study focused specifically on this question found that discontinuing oral contraceptives was an effective blood pressure-lowering intervention, with measurable improvement over an average follow-up of about 6 to 7 months. The large prospective U.S. study found that past users had only a slightly elevated risk of hypertension (1.2 times the baseline) compared to 1.8 times for current users, suggesting blood pressure largely normalizes over time.
That slight residual elevation in past users may reflect the fact that some women who developed hypertension on the pill had underlying susceptibility that would have eventually surfaced regardless. In practical terms, if you stop the pill and your blood pressure doesn’t come down within several months, the cause may not have been the pill alone.
What to Watch For
High blood pressure rarely causes symptoms you can feel, which is why it’s called a silent condition. You won’t know the pill is raising your blood pressure unless you check it. If you’re on combined oral contraceptives, periodic blood pressure readings are worth the minimal effort, particularly if you’re over 35, carry extra weight, or have a family history of hypertension. Home blood pressure monitors are inexpensive and accurate enough for this kind of tracking.
If your readings start creeping above 130/80 on multiple occasions, that’s worth a conversation about whether your current contraceptive method is the best fit. Switching to a progestin-only option or a non-hormonal method can eliminate the blood pressure concern entirely while still providing effective contraception.