Many people worry about whether birth control pills can cause cancer. The answer is more nuanced than headlines often suggest.
The International Agency for Research on Cancer (IARC), which is part of the World Health Organization, classifies combined oral contraceptives as Group 1 agents. Group 1 means there is strong evidence that a substance can influence cancer risk, but it does not mean everyone who uses it will get cancer.
Research shows that long-term use of birth control pills slightly increases the risk of:
Breast cancer
Cervical cancer
However, the pills also protect against several other types of cancer, including:
Ovarian cancer risk can drop by 30–50%
Endometrial (uterine) cancer
Colorectal cancer
The protective effect can last years after stopping the pills. (National Cancer Institute)
Important context
Group 1 includes other substances like tobacco smoke and alcohol. The label indicates strong scientific evidence of risk, not equal danger levels. In other words, being in Group 1 doesn’t mean birth control pills are as harmful as smoking.
Editorial Note
Birth control pills are widely studied and generally safe for most users. Doctors consider individual health, family history, and personal risk factors before prescribing them. The key is balanced understanding: small risks for some cancers versus protective benefits for others.
Sources:
- IARC Monographs Programme (International Agency for Research on Cancer)
- National Cancer Institute – Oral Contraceptives and Cancer Risk
- WHO Reproductive Health Guidance
