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It cannot be said that all women who have breast cancer have had abortions.  Similarly, not all women who have had abortions will get breast cancer. 

Nevertheless, abortion is the most preventable risk factor for breast cancer.

First Way Abortion Causes Breast Cancer

Women have the right to know that 28 of 37 worldwide studies have independently linked induced abortion with breast cancer. 

Thirteen of fifteen studies conducted on American women report increased risk.  Seventeen studies are statistically significant, sixteen of which found increased risk. 

Most of the studies have been conducted by abortion supporters.  The first study was published in an English publication in 1957 and focused on Japanese women.  It showed a 2.6 relative risk or 160% increased risk of breast cancer among women who’d had an induced abortion.  [Segi et al. (1957) GANN 48 (Suppl.):1-63]

These studies suggest that an induced abortion cause biological changes to occur in a woman’s breasts which make her more susceptible to breast cancer.  This is one of two ways in which abortion causes breast cancer.  The biological rationale for this phenomenon can be found on our ABC Summary page. 

Delayed first full term pregnancy is a second way in which abortion causes this disease.

Abortion is an “elective surgical procedure and a woman’s exposure to the hormones of early pregnancy — if it is interrupted — is so great, that just one interrupted pregnancy is enough to make a significant difference in her risk” [Professor Joel Brind, President, Breast Cancer Prevention Institute, Endeavour Forum Public Meeting, August 24, 1999, Malvern, Victoria, Australia].

Because American Women already face a high lifetime risk of developing breast cancer of about 12.5 percent, boosting that risk by even a small percentage through the procurement of a single induced abortion is comparable to the risk of lung cancer from long-term heavy smoking. 

Approximately 1 in 100 women procuring an abortion is expected to die as a result of abortion-induced breast cancer…


Click here to find out:

Risks and complications

Abortion risks and complications

Woman’s health after abortion: A Fresh Look At the Evidence

FACT: “16 of 17 statistically significant studies report increased risk of breast cancer among women choosing an abortion. 7 studies report more than a two-fold increased risk.” – From Coalition on

Abortion-Breast Cancer connection —

Abortion-Breast Cancer Link

Breast Cancer Prevention Institute

Essential Background

The Breast Cancer Connection