When it comes to birth control, everyone seems to have a story to share — a friend who swears the pill caused weight gain, a cousin who says an IUD “messed up her hormones,” or a TikTok influencer claiming that going off birth control “resets” your body. With so much chatter, it’s easy to see how myths about contraception have taken on a life of their own. But decades of medical research and clinical experience tell a very different story.
At leading academic programs like Harvard Medical School’s Department of Obstetrics, Gynecology & Reproductive Biology and the University of California, San Francisco (UCSF) Department of OB/GYN, doctors in training spend years studying the safety, science, and social aspects of contraception. Their findings—and the experiences of our practicing clinicians here at Carlos & Parnell, M.D., P.A.—help separate fact from fiction and guide patients toward the birth control methods that best fit their needs.
We will take a closer look at some of the most common myths about birth control, explain what research actually shows, and connect you with a few trusted resources for learning more.
Myth 1: “Birth control pills (or IUDs) will make me infertile in the future”
Reality: One of the most persistent fears is that using contraception will impair your ability to conceive later. But evidence strongly counters this. For example, an article by the American Medical Association notes that fertility declines naturally with age, not simply because of prior contraceptive use. Moreover, a fact sheet from the Boston Women’s Health Initiative affirms that “Using birth control does not cause infertility. Once you stop taking it, your fertility typically returns to normal.”
Clinical context: Long-acting reversible contraception (LARC) such as IUDs and implants have become standard fare in academic OB/GYN training (e.g., UCSF). They are taught not only as effective for pregnancy prevention but also reversible, making fertility-return the norm.
For your further reading: Our post titled “Dealing with Late Periods While on Birth Control and Possible Causes.” That article helps frame how menstrual changes during contraception can raise questions—but are not a signal of long-term fertility damage.
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Myth 2: “All birth control causes significant weight-gain and hormone imbalance”
Reality: Many people believe that starting hormonal contraception inevitably leads to substantial weight gain, hair loss, mood “swings,” or hormonal chaos. But the science paints a more nuanced picture. For example, the Cleveland Clinic notes there is no strong evidence linking modern hormonal contraception with major weight gain: “Research does not show that birth control causes significant weight gain.” Similarly, the AMA article remarks that stress has a greater effect on hormone fluctuation than most contraceptive hormones.
Clinical context: During OB/GYN residency programs (e.g., Harvard’s program), residents learn to counsel patients that while some individuals may experience minor fluid retention or appetite-related effects, these are usually modest and often related to lifestyle/time of life rather than the pill itself.
Tip for patients: If you’re concerned about side-effects, ask your OB/GYN about low-dose hormonal options or non-hormonal methods (like the copper IUD) and request follow-up after 3 months to assess changes.
For further reading: The same “Late Periods While on Birth Control” article may help in understanding how hormonal shifts can affect the cycle (even if they don’t cause major weight or fertility issues).
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Myth 3: “If I’m breastfeeding, I don’t need birth control; I can’t get pregnant”
Reality: While exclusive, frequent breastfeeding within six months postpartum can reduce fertility via the lactational amenorrhea method (LAM), it is not a guaranteed method unless all criteria are strictly met. The Cleveland Clinic explicitly debunks this myth. Also, many people underestimate how soon ovulation can resume, meaning conception is still possible.
Clinical context: Medical trainees at UCSF Ob/Gyn and elsewhere are taught to counsel postpartum women about timing of contraception resumption and the limitations of relying solely on breastfeeding for pregnancy prevention.
What you can do: If you are breastfeeding and do not wish to conceive yet, talk to your provider about safe options (progestin-only pills, implants), and whether the pill is appropriate given postpartum risk factors (e.g., clotting).
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Myth 4: “Using birth control protects against STIs / I don’t need condoms”
Reality: This myth is particularly dangerous. Many individuals assume that oral contraceptives, IUDs, or implants also protect from sexually transmitted infections (STIs). That is false. Only condoms (and in some cases dental dams) offer barrier protection against STIs; hormonal methods do not.
Clinical context: In OB/GYN education (for example at Harvard), trainees are explicitly taught to recommend dual-method protection: a hormonal or LARC method plus condoms when STI risk exists or partner status is uncertain.
What this means for you: If your primary goal is pregnancy prevention and STI prevention, don’t assume a “single” method suffices. Ask your provider about dual strategy, and if you’re using IUD or implant, still use condoms (especially with new/unknown partners).
Further reading: For more detail on menstrual effects of birth control (though not STI-specific), our post “Why it’s important to discuss periods despite how uncomfortable it may be” is a helpful resource.
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Why myths persist and how to avoid them
The spread of misinformation about contraception is real. According to the AMA article, social media platforms—especially TikTok—are “hotbeds of misinformation” with high volumes of persuasive but inaccurate videos about hormonal contraception. Meanwhile, empirical resources show that myths such as “birth control causes cancer” or “you can’t get pregnant if you have sex during your period” are repeatedly debunked by academic and clinical sources.
How to safeguard yourself:
•Talk openly with a board-certified OB/GYN about your personal health history, goals, and preferences.
•Ask specifically: “Will this method affect my future fertility?”, “What side-effects are likely or unlikely?”, “How well does this method protect me against STIs if I’m sexually active with more than one partner?”
•Use trusted sources for patient education (blogs, academic medical center websites) rather than anecdotal social-media posts.
•Remember: contraception is individualized. Methods that work well for one person may not suit another based on age, smoking status, migraine history, blood-clot risk, etc. Academic programs stress personalized counseling.
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Contraception remains one of the most powerful tools for reproductive planning, yet myths and misconceptions undermine its safe use. Whether it’s fears of infertility, weight gain, protection against STIs, or mis-understanding postpartum contraception, the facts tell a much more balanced story—rooted in decades of OB/GYN training and peer-reviewed evidence. If you’d like to dive deeper, I’d encourage you to read these posts from Carlos & Parnell: “Dealing with Late Periods While on Birth Control and Possible Causes” and “Why it’s important to discuss periods despite how uncomfortable it may be”.
Your body, your choices and your goals all matter—and when your contraception aligns with evidence and personalized care, you’re empowered to make the best decisions for your health.
