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Published on: 7/21/2026

What are birth control pills?

Birth control pills are daily oral medications used by women to prevent pregnancy. They contain hormones that work in two main ways: stopping the ovaries from releasing eggs (ovulation) and altering the lining of the uterus and cervical mucus to make it harder for sperm to reach an egg. When taken correctly, birth control pills are one of the most effective forms of contraception.

If you're experiencing side effects, unusual symptoms, or aren't sure whether birth control pills are right for you, it's important to get clarity before making decisions about your health. Take a free, instant, online symptom check to better understand what your body may be telling you and confidently plan your next steps.

Reviewed for medical accuracy: 07/20/2026

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Explanation

Birth control pills, also known as oral contraceptives, are a type of medication used by women to prevent pregnancy. They usually contain hormones that stop the ovaries from releasing eggs. This is a key part of how they prevent pregnancy.

How They Work

  1. Preventing Ovulation: The hormones in the pills stop the ovaries from releasing eggs.
  2. Thickening Cervical Mucus: The pills make the mucus in the cervix thicker, which makes it harder for sperm to enter the uterus.
  3. Thinning Uterine Lining: They also make the lining of the uterus thinner, which makes it less likely for a fertilized egg to attach.

Types of Birth Control Pills

  • Combined Pills: These have two hormones, estrogen and progestin, and are taken daily.
  • Progestin-only Pills: These have only one hormone, progestin, and are sometimes available over-the-counter.

Birth control pills are a reliable way to prevent pregnancy when taken correctly, but it is important to follow the instructions and take them as directed. If you're experiencing any unusual symptoms or side effects while taking birth control, try our free AI symptom checker to help understand what might be happening.

(References)

  • Frye CA. (2006). An overview of oral contraceptives: mechanism of action .... Neurology, 16567739.

  • Dragoman MV. (2014). The combined oral contraceptive pill. Best practice & research. Clinical obstetrics & gynaecology, 25028259.

  • Daher N, & Bohensky J. (2025). Opill (norgestrel): Where does the OTC birth control pill fit .... JAAPA : official journal of the American Academy of Physician Assistants, 40421941.

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