Birth control pills (also called oral contraceptive pills) are medicines that contain hormones to prevent pregnancy. They can affect health in both positive and negative ways. Most healthy people can use them safely under medical guidance.
How birth control pills work
Birth control pills:
- Stop the ovaries from releasing an egg (ovulation).
- Thicken cervical mucus so sperm cannot easily reach an egg.
- Make the lining of the uterus thinner, making pregnancy less likely.
There are two main types:
- Combined pills contain estrogen and progestin.
- Progestin-only pills contain only progestin.
Health benefits
Birth control pills can:
- Prevent pregnancy when taken correctly.
- Make menstrual periods more regular.
- Reduce heavy menstrual bleeding.
- Decrease menstrual cramps.
- Improve acne in some people.
- Help treat symptoms of Polycystic ovary syndrome and Endometriosis.
- Lower the risk of Ovarian cancer and Endometrial cancer.
Common side effects
These are often mild and may improve after 2–3 months:
- Nausea
- Headache
- Breast tenderness
- Spotting or irregular bleeding
- Mood changes
- Bloating
- Mild weight changes (not everyone experiences this)
- Reduced or increased sexual desire
Serious health risks (rare)
Although uncommon, birth control pills can increase the risk of:
- Blood clots in the legs or lungs
- Stroke
- Heart attack
- High blood pressure
- Liver problems (rare)
The risk is higher if you:
- Smoke, especially if you are over 35 years old.
- Have uncontrolled high blood pressure.
- Have a history of blood clots.
- Have certain types of migraine with aura.
- Have some heart or liver diseases.
Who should avoid combined birth control pills?
A healthcare professional may advise against combined pills if you:
- Are pregnant.
- Smoke and are older than 35.
- Have had blood clots, a stroke, or a heart attack.
- Have severe liver disease.
- Have certain hormone-sensitive cancers.
When to seek medical care immediately
Get urgent medical attention if you have:
- Severe chest pain
- Sudden shortness of breath
- Severe headache unlike your usual headaches
- Vision changes
- Swelling, redness, or pain in one leg
- Weakness or numbness on one side of the body
These symptoms could indicate a serious complication such as a blood clot or stroke.
Do birth control pills cause infertility?
No. Birth control pills do not usually cause permanent infertility. Fertility typically returns within weeks to a few months after stopping the pills, although the timing varies from person to person.
Summary
For most healthy people, birth control pills are safe and effective. They have many benefits beyond preventing pregnancy, but they also have possible side effects and rare serious risks. The best choice depends on your age, medical history, smoking status, and other health conditions, so they should be used under the guidance of a qualified healthcare professional.