MyBCTeam

Weight gain from tamoxifen or anastrozole (Arimidex) can vary quite a bit from person to person. Research suggests the gain from aromatase inhibitors like anastrozole is often small — but real-life experiences tell a different story for many people.

Some MyBCTeam members have reported gaining anywhere from 10 to 35 pounds Show Full Answer

Weight gain from tamoxifen or anastrozole (Arimidex) can vary quite a bit from person to person. Research suggests the gain from aromatase inhibitors like anastrozole is often small — but real-life experiences tell a different story for many people.

Some MyBCTeam members have reported gaining anywhere from 10 to 35 pounds while on these medications, which can feel really frustrating, especially when eating well and exercising regularly. A few factors can increase the likelihood of more significant weight gain, including:

- Being under 60 years old
- Having had a mastectomy
- Smoking cigarettes
- Going through menopause during treatment

Weight gain tends to be more common during the first year of treatment. It's also worth knowing that other factors — like recovery from chemotherapy, reduced activity, or hormonal changes — can contribute too. If weight changes are a concern, speaking with an oncologist or a registered dietitian is a great step. They can help identify the cause and create a plan that works for your specific situation.

 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.

Does Anastrozole Cause Weight Gain? 7 Tips To Manage Weight on Aromatase Inhibitors

Does Tamoxifen Cause Weight Gain? 7 Tips To Manage