Thanks for your post asking about tamoxifen and the menopause.
Some women who were still having regular periods before they started on tamoxifen find that their periods can change. They may become lighter, irregular or as you say, they may stop altogether for some.
It sounds like your periods have become more irregular, which is normal and heavy periods can be a sign of approaching the menopause. However, as your periods have become heavier and more painful, we would suggest talking to your treatment team or breast care nurse about this. They can assess you and see if they need to adjust your treatment.
Do call our Helpline if you would like to talk this through or have any further questions. Your call will be confidential, and the number is free from UK landlines and all mobile networks.
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I’ve now been in Tamoxifen for over two years (I have to take it for a total of 10). Prior to this my periods were regular. I’m now 50 and still having periods every couple of months or so. They are very heavy and painful.