There is no clear evidence thatTamoxifencauses weight gain however it is possible that it can cause some fluid retention and rarely swelling in the ovaries. I am not sure if that is causing your stomach to look bigger.
As you know you can gain weight for many reasons such as living a less active life and eating more.
Do mention this to your breast team when you next see them.
Please get back to us if you need any more information or support. You may find it helpful to talk things through with one of the nurses on our helpline. The number to call is Freephone 0808 800 4040 and the lines are open from 9am till 5pm Monday to Friday.
