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Abnormal Vaginal Bleeding & Birth Control

author image April Khan
April Khan is a medical journalist who began writing in 2005. She has contributed to publications such as "BBC Focus." In 2012, Khan received her Doctor of Public Health from the University of Medicine and Dentistry of New Jersey. She also holds an Associate of Arts from the Art Institute of Dallas and a Master of Science in international health from University College London.
Abnormal Vaginal Bleeding & Birth Control
Birth control pills can cause abnormal bleeding in the first few months of use.

The paradox of birth control is that it can both treat abnormal bleeding and cause it. Women with medical conditions that cause abnormal vaginal bleeding can take birth control pills to regulate it. Conversely, women with perfectly normal menstrual cycles may take them for other reasons and end up with vaginal bleeding as a side effect of the pill.

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Make sure the abnormal bleeding is a side effect of the birth control pills. Contact a physician as soon as the bleeding occurs. Abnormal vaginal bleeding can be heavy or scant and can also occur between menstrual cycles. Many women experience an abnormal bleed during menstruation.

Abnormal Bleeding Caused by Birth Control

One of the most common causes of abnormal bleeding comes from not taking birth control pills correctly, either by missing a dose or not taking them at the correct times. Bleeding can also occur normally within the first four months of use according to the Dr. Spock website. This form of bleeding usually subsides on its own. Bleeding can also occur after prolonged use of using birth control, due to the thinning of the uterine walls.

Birth Control to Treat Abnormal Bleeding

Women who have medical conditions that cause abnormal bleeding such as polycystic ovary syndrome or endometriosis may be treated by use of birth control pills. There are different kinds of birth control pills; the ones used to treat these conditions are known as combination pills. These birth control pills contain low doses of estrogen and progesterone in a synthetic form. Since these conditions cause an imbalance in the hormones estrogen and progesterone, low-dose birth control pills are given to control and regulate the menstrual cycle. Women who have heavy menstrual bleeding may also use these pills to lighten the bleeding. According to Epigee, women can also use contraceptive rings, patches or injections for the same results.


Any bleeding that occurs while taking the birth control pills should be reported to a physician, unless advised otherwise by a health provider. It is normal for a woman to experience breakthrough bleeding when first using birth control. However this bleeding should not be heavy or cause abdominal pain.


Women who are using birth control and want to avoid instances of breakthrough bleeding should take the birth control pills every day and at the same time daily. The pills may cause this bleeding in the beginning but it should taper off with further use.

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