Hello all, I had grade 3 breast cancer 5 years ago with chemo therapy surgery radiotherapy etc.
I didn't gain any weight on treatment but rather lost weight as i felt very ill on it. Following the treatment however and tamoxifen i have gained around 5 kgs.. despite being incredibly active exercise 5 days a week and eating a very healthy whole foods plant based diet. i feel so annoyed about it and i don't know what to do - i stopped tamoxifen now as im fed up..
Has anyone been through this and have you managed to lose the weight? I feel desperate ..
Grateful for all your experiences and input.
kr
Linan
Hi and a very warm welcome to the online community
Gaining weight while being active and eating well must be tremendously demoralising and it's perhaps natural to presume that it's a side effect of the tamoxifen that you're taking. I've found this information from Macmillan on the drug's side effects but weight gain isn't something that's mentioned. I presume you spoke to your BCNS about this when you told her you were going to stop taking tamoxifen. Was she able to help at all?
When you have a minute, it would be great if you could pop something about your journey so far into your profile as it really helps others when answering or looking for someone with a similar diagnosis. It also means that you don't have to keep repeating yourself. To do this click on your username and then select 'Profile'. You can amend it at any time and if you're not sure what to write you can take a look at mine by clicking on my username.
x
Whatever cancer throws your way, we’re right there with you.
We’re here to provide physical, financial and emotional support.
© Macmillan Cancer Support 2025 © Macmillan Cancer Support, registered charity in England and Wales (261017), Scotland (SC039907) and the Isle of Man (604). Also operating in Northern Ireland. A company limited by guarantee, registered in England and Wales company number 2400969. Isle of Man company number 4694F. Registered office: 3rd Floor, Bronze Building, The Forge, 105 Sumner Street, London, SE1 9HZ. VAT no: 668265007