Tamoxifen and Headaches

Hi, been on Tamoxifen since March and for the past few days have had a more or less constant headache. Haven’t changed brands so can’t be that. Will give it a few more days before I speak to BCN however just wondered if anyone else has experienced this and if it is a common side-effect - there are so many. It is not so bad that I need painkillers but is unpleasant non the less.
Many Thanks Ladies

Bumping to see if anyone has any advice re. this.

I started on Tamoxifen in March of last year and by the end of October beginning of November 2010 I was getting bad, constant headaches and nausea. I’m afraid I was also starting to feel panicky and really anxious too - a very unpleasant feeling I must say. The doctor told me that Tamoxifen builds up in the body over time and in my case, I had become intolerant. As soon as I stopped taking it the headaches and nausea stopped virtually immediately.

I realise that this isn’t very helpful so I would suggest that if the headaches continue or other side effects become more noticeable then do seek advice from the doctor. It would seem that Tamoxifen has a lot of side effects which aren’t listed or accepted but you know what is normal for your body. If you don’t feel right then get it checked out.

Good luck.
Val x

Hi haughtaj

As well as the advice and information you receive from your fellow forum members you may also find it useful to read the BCC publication on tamoxifen, it contains a section on side effects. If you would like to order a copy or read this on line just follow this link:-


I hope this is helpful.

Best wishes Sam, BCC Facilitator