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Hormonal Contraception
For most women, hormonal contraception is the single most consequential medication they'll ever take — daily, for years, starting young. The contraceptive efficacy is excellent, and the long-term cancer balance, surprisingly, comes out net positive. But methods aren't interchangeable: clot risk, mood, libido, and bleeding pattern shift sharply depending on which one you pick.
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The biggest trade is efficacy versus daily attention. An IUD or implant means one clinic visit, then nothing to remember for years, with under 0.2% failure. A pill means daily attention and a 9% real-world failure rate — almost all of that gap is forgotten doses. The non-contraceptive perks are real: lighter periods, less pain, clearer skin, lower ovarian cancer risk for decades after you stop. The mood signal is real too, especially in the first months and especially for teens — if you feel worse, switch.

The hormones do three things. Estrogen suppresses the brain signal that triggers ovulation. Progestin blocks the ovulation surge directly and thickens cervical mucus into a sperm barrier. Combined methods — most pills, the patch, the ring — use both. Progestin-only methods — the implant, the injection, the hormonal IUD, the mini-pill — skip estrogen, which is what makes them safer for clot-prone or breastfeeding users.

Where the hormone is delivered changes how much enters the bloodstream. Pills, patches, rings, and injections circulate it everywhere. The hormonal IUD releases progestin into the uterus, with only a small fraction reaching the blood — which is why people with heavy periods can see dramatic relief without much systemic effect CDC US-MEC 2016.

What the numbers actually look like

Method choice dominates everything else. The Contraceptive CHOICE Project — 7,486 women, three years, every method free — pinned the typical-use failure rates that matter, and the gap between methods you have to remember and methods you don't turned out to be enormous.

The long-term cohort data is more encouraging than the public conversation suggests. Ever-users of combined pills have lower lifetime risk of ovarian, endometrial, and colorectal cancers, no overall cancer-incidence increase, and modestly lower all-cause mortality — the 44-year Royal College follow-up of 46,022 women Iversen et al. 2017 Hannaford et al. 2010. Ovarian cancer protection alone runs about 20% lower risk per five years of use, and the protection holds three decades after stopping Collaborative Group 2008.

The risks are real but small in absolute terms and method-dependent. Combined methods raise clot risk, sharply for some progestin types and modestly for others.

Combined pills also raise stroke and heart attack risk. The absolute numbers stay small for a young healthy woman and multiply sharply if you smoke and are over 35 Lidegaard et al. 2012. The breast cancer signal is small and time-limited: about one extra case per 7,690 women per year of current use, fading within a decade of stopping Mørch et al. 2017. The cervical cancer signal also fades within a decade of stopping IARC 2007. Progestin-only methods carry essentially none of the clot, stroke, or estrogen-related risks CDC US-MEC 2016.

Picking a method

The decision is mostly about three trade-offs: efficacy versus daily attention, estrogen versus no estrogen, and how you want your periods to look.

Most clinicians will hand you a version of this flowchart. If yours doesn't, ask. The default first-line in current US and WHO guidance is an IUD or implant, mostly because typical-use efficacy is so much better than for short-acting methods CDC US-MEC 2016.

When the combined methods are off the table

The combined methods — pill, patch, ring — have a real don't-do-this list, built around clot and stroke risk. Progestin-only methods (IUD, implant, injection, mini-pill) clear nearly all of it WHO MEC 2015.

Where it lands differently

Teenagers carry the largest mood signal in the data. The Danish national cohort found roughly 80% higher rates of starting an antidepressant in 15-to-19-year-olds within the first six months of any hormonal method, versus about 23% in adult users Skovlund et al. 2016. That doesn't mean don't prescribe — most teens do fine — it means watch the first months closely and switch fast if mood drops.

Postpartum, the combined methods are off the table for at least three weeks because clot risk peaks right after birth — longer if you're breastfeeding. Progestin-only methods, the hormonal IUD, and the copper IUD are all compatible with nursing CDC US-MEC 2016.

In the run-up to menopause, hormonal contraception does double duty: pregnancy is still possible, and the same hormones tame heavy bleeding, hot flashes, and irregular cycles. The hormonal IUD pairs well with this transition, including as the progestin half of menopausal hormone therapy later on.

If you want no hormones

The copper IUD is the closest non-hormonal equivalent: under 1% failure per year, ten-plus years per device, no systemic effects. The trade is heavier and crampier periods, especially for the first six months Trussell 2011.

Condoms are the only contraceptive that also blocks STIs, but typical-use failure runs around 18% per year — high enough that condoms-only is rarely the long-term plan for users who don't want pregnancy.

Fertility-awareness methods vary widely. Well-taught users of the symptothermal method get to 2-5% typical-use failure; users of phone apps as commonly used get closer to 15-25%. They work for engaged users with stable cycles.

Tubal ligation and vasectomy end the question permanently. Vasectomy is the simpler procedure with shorter recovery; tubal ligation is more invasive but available when a partner won't or can't have one.

What people get wrong

The pill doesn't make you gain weight. Controlled comparisons consistently find no clinically meaningful difference between combined pills and placebo. The single exception is the injection (DMPA), which adds about 2-3 kg in the first year for many users.

The pill doesn't ruin your fertility. Ovulation resumes within a couple of cycles for nearly everyone stopping pills, patch, ring, IUD, or implant. The injection is the outlier — return to ovulation can take 6 to 12 months, occasionally longer Kaunitz et al. 2008.

The injection's bone effect mostly reverses. DMPA reduces bone density during use — about 5-7% over two years, which earned an FDA warning — but density recovers toward baseline after stopping Kaunitz et al. 2008. For adolescents whose bones are still accruing, this is a real consideration and a reason to think twice about multi-year DMPA use. For adults on it for a year or two, it usually isn't.

You don't need to take a break. Cycling on and off doesn't reset anything biologically; it just raises your chance of an unintended pregnancy during the gap.

How it actually goes wrong

The pill goes wrong by being forgotten. Missing one dose is usually fine; missing two raises ovulation risk fast. The patch goes wrong by peeling off in a sweaty week. The ring goes wrong by being out of place more than three hours. The injection goes wrong by drifting past the 13-week mark. And it can fail chemically — St John's wort, and a handful of prescription drugs that rev up the same liver enzymes, clear the hormones faster and quietly drop a combined pill below the line of protection, so run any new supplement or medication past your method first.

The other way it goes wrong is by waiting too long on a method that isn't working. If mood drops noticeably in the first three months on any hormonal method, the right move is to switch — to a different progestin, a non-hormonal method, or off entirely — not to ride it out. The mood signal in the literature is concentrated in those early months Skovlund et al. 2018. If libido drops and stays down, same answer: switch, don't tough it out. The advice to "give it three months" applies to bleeding patterns, not to mood or desire Pastor et al. 2013.

What this looks like in real life

In the US under the ACA, all FDA-approved methods are covered with no copay on most insurance plans. Without insurance: generic pills run $15-50 a month; the patch and ring run more; the injection runs $30-150 every three months. IUDs and implants run $0 to about $1,300 up front for the device and insertion, but spread across the 5-to-8-year life of the device they come out cheapest per year of all the methods.

Pills, patches, and rings need a prescription you can get via telehealth in under fifteen minutes in most states. The injection requires a clinic visit every three months. The IUD and implant require one insertion appointment — about 10 to 15 minutes for an implant, 5 to 10 for an IUD, with a day or two of cramping after. Insertion discomfort varies a lot; ask about local anesthetic options.

What changes

What changes in the first weeks is the period. Lighter, often dramatically — on the 52 mg hormonal IUD, many users stop bleeding entirely within a year. Less cramping, less PMS, fewer of the days you used to write off. For users with endometriosis, adenomyosis, or PCOS, the relief from cyclical pain or symptom burden often arrives within a few months. Acne typically clears on a combined pill in three to six months Arowojolu et al. 2012.

What changes over years is harder to feel and more important. Five years on a combined pill cuts ovarian cancer risk by about half, and the protection holds for three decades after you stop Collaborative Group 2008. The same window lowers endometrial and colorectal cancer risk. You'll never notice the cancer that didn't happen, but the actuarial picture is real.

What the conversation usually misses: knowing pregnancy is settled background math rather than a per-cycle worry changes the texture of the rest of the relationship. The person who isn't tracking late periods is a different person, in small ways, from the one who is.

Adjacent things worth knowing

If you had unprotected sex and need a backup right now: a copper IUD inserted within five days is the most effective option; levonorgestrel and ulipristal pills work up to 72-to-120 hours after, with effectiveness depending on which pill and when. Each is worth its own short read.

If you're planning pregnancy soon, the timing of stopping matters mostly for the injection (the 6-to-12-month return-to-ovulation lag); other methods can be stopped the cycle before trying. If you're after deeper coverage of period-related conditions in their own right — endometriosis, PMDD, PCOS — those are separate topics where hormonal contraception is one tool among several.

Related in the handbook
Worsens / aggravates
  • — St John's wort can quietly lower the pill's hormone levels enough to cause a failure — check any supplement against your contraception.
  • — St John's Wort speeds up how fast your body clears these hormones, which can quietly drop a pill's protection — a real cause of failure.
Helps
  • — For adenomyosis, the levonorgestrel IUD is first-line treatment, not just contraception.
  • — Used continuously to suppress ovulation, hormonal contraception is a core PMDD treatment, not just birth control.
  • — Continuous hormonal contraception is a mainstay for controlling endometriosis pain.
  • — Beyond birth control, the hormonal IUD and the pill are first-line treatments for heavy periods.
  • — The combined pill is a workhorse for PCOS — it regulates cycles and calms the skin and hair symptoms.
  • — For fibroid-driven heavy bleeding, the hormonal IUD is often the simplest effective option.
  • — Still fertile in your 40s? A low-dose pill can steady the erratic perimenopausal bleeding and hot flashes while you still need contraception.
Related
  • — If you get migraine with aura, that changes which contraceptives are safe — combined estrogen pills raise stroke risk.
  • — The same hormonal IUD that handles contraception can later serve as the progestin half of menopausal hormone therapy.
  • — Going on or off a hormonal method reshapes your bleeding pattern — tracking it tells you what's normal for your method and what isn't.
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