Please note: This information was current at the time of publication. But medical information is always changing, and some information given here may be out of date. For regularly updated information on a variety of health topics, please visit, the AAFP patient education website.

Information from Your Family Doctor

Birth Control Pills and Bleeding


Am Fam Physician. 2002 May 15;65(10):2083.

What is abnormal bleeding? Will I have it when I take birth control pills?

Abnormal bleeding is bleeding at a time other than when you have your period. Many women have some spotting (light bleeding) during the first 3 to 4 months that they take birth control pills. After this time, the bleeding usually stops or is less.

Some women have spotting the whole time that they take birth control pills. The reason for this is not known. The spotting is not dangerous, but it can be annoying.

What could make me more likely to have abnormal bleeding?

You might have abnormal bleeding if you forget to take even one pill. Therefore, it is important to remember to take your birth control pill at the same time every day.

If you smoke, you are more likely to have abnormal bleeding.

If I have abnormal bleeding, what should I do?

Keep taking your birth control pills if the bleeding happens in the first 3 to 4 months after you start taking the pills. If you smoke, quit smoking.

Call your doctor if:

  • You have bleeding after taking the pill for 3 to 4 months. This is especially important if the bleeding is heavy.

  • You forget to take more than two pills and have sex without using a condom or other birth control method.

  • You have sex with someone who might have a sexually transmitted disease.

  • You have headaches, new swelling in your legs, start bruising easily, or feel very tired.

  • You find out your blood pressure or cholesterol level is high.

Your doctor might give you a pelvic exam. You might have a pregnancy test and a test to see if you have anemia. (Anemia is low red blood cells.) You might have other tests, depending on the problems you are having.

If your bleeding is heavy, your doctor might give you more estrogen to try to stop the bleeding. Your doctor might switch you to a different birth control pill.

This handout is provided to you by your family doctor and the American Academy of Family Physicians. Other health-related information is available from the AAFP online at

This information provides a general overview and may not apply to everyone. Talk to your family doctor to find out if this information applies to you and to get more information on this subject.


Copyright © 2002 by the American Academy of Family Physicians.
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