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Yes, tamoxifen can cause changes to your menstrual cycle, and for some people, that includes heavier periods. Periods may also last longer than usual or come with cramping and blood clots. That said, everyone's experience is different — some people have lighter periods, irregular cycles, or their period stops altogether.

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Yes, tamoxifen can cause changes to your menstrual cycle, and for some people, that includes heavier periods. Periods may also last longer than usual or come with cramping and blood clots. That said, everyone's experience is different — some people have lighter periods, irregular cycles, or their period stops altogether.

One MyBCTeam member shared, "I feel my cramps are terribly painful, and my period is just heavier overall." It's worth knowing that heavy bleeding can sometimes lead to anemia (low red blood cell levels). Signs of anemia include:

- Extreme tiredness or weakness
- Dizziness or lightheadedness
- Shortness of breath
- Headaches
- Cold hands and feet
- Pale or yellowish skin Unusual or heavy vaginal bleeding should always be reported to your healthcare provider. It can sometimes point to changes in the uterus, such as polyps, fibroids, or in rare cases, endometrial cancer — a known but low risk associated with tamoxifen.

Your care team can help figure out what's causing the bleeding and discuss safe options to manage it, which may include certain types of IUDs or reassessing your tamoxifen treatment.

 AI-generated responses are not a substitute for medical advice. These services are not intended to diagnose, treat, or cure any condition or disease. Always ask your doctor about specific health concerns.

Tamoxifen and Heavy Periods: 7 Facts To Know