Skip to content
Forum IndexForum: Young Women with Breast Cancer → Topic: Tamoxifen and menstrual cycle
« Forum: Young Women with Breast Cancer: Share experiences, advice, and support with others who are under 40 and have been diagnosed with breast cancer.

Topic: Tamoxifen and menstrual cycle

Log in to post a reply
Joined: Sep 2004
Posts: 170
  • Posted on: Sep 27, 2007 08:06 pm, edited Sep 27, 2007 08:06 PM by JillCR
JillCR wrote:

I have been on tamoxifen since '05 and so far my periods have been okay, I went from 28 days to 29, then even 31 days. It would only last about 3 days. Definitely is not what it used to be. I am about a week late, so of course I got a pregnancy test, 2 in fact and both were negative.  My breast are sore and I'm crampy, but nothing, what is happening?

Posts 1 - 16 (16 total)
hollandstat…
Joined: Jun 2007
Posts: 4
Sep 30, 2007 02:26 pm hollandstat wrote:

I will start tamoxifen after I complete radiation.  It was my understanding that the tamoxifen will stop my cycle, but I see you still have one.

Janine
Joined: Oct 2005
Posts: 21
Oct 2, 2007 05:33 pm Janine wrote:

I have been on Tamoxifen since January 2005.  My remaining breast is tender and I'm waiting for a period.  Mine are much more erratic.  I had two last month and now nothing.  Hadn't had any for a year prior to that.  Just hate the pain in my left breast.  Ready to have it taken off but I keep thinking "It's just the Tamoxifen doing it's job".  Guess I'm not alone with weird symptoms.

Felicia
Joined: Nov 2004
Posts: 1728
Oct 2, 2007 05:40 pm, edited Oct 2, 2007 05:41 PM by Felicia Felicia wrote:

My ob/gyn told me that only a percentage of women stop getting periods altogether while on tamoxifen (I forget what the percentage was; I'll have to get back to you on that). Many (if not most) women still get periods, either regularly or sporadically. I'm a few days late as well, Jill, but KNOW I'm not pregnant (h2b has been "fixed," lol). PMS and menstral symptoms without a period happen a few times a year to me and I've been on Tamoxifen for almost three years (I'll be 41 in January).

Kiai! :D
gina1107
Joined: Nov 2007
Posts: 1
Nov 12, 2007 06:18 pm gina1107 wrote:

I have been on tamoxifen since May 07 and have not had a period since April 07 after my mastectomy. But today i got my period after 7 months and it kind of freaked me out a bit. I thought that I wouldn't get it anymore{I'm 43}. After reading your comments though it has calmed me down. Thanks  

Fleurdelis
Joined: Feb 2003
Posts: 99
Nov 17, 2007 06:50 pm, edited Nov 17, 2007 06:50 PM by Fleurdelis Fleurdelis wrote:

My period did not stop during chemo, or Tamoxifen.  Tamoxifen actually made me more regular at first, approx. every four weeks for the first time in many years, but shorter than my natural cycle, usually only 2 days instead of 3-4.  As the years on Tamoxifen went by (I'm at 4 1/2 years now), my cycle got longer.  Now I average a period every 5-5 1/2 weeks, but sometimes I go as long as 7 weeks without one.  Don't let small changes trouble you.  My gyn said they often happen.

Fleurdelis
awb
Joined: Aug 2005
Posts: 1756
Nov 17, 2007 07:29 pm awb wrote:

my oncologist explained that 25% continue with normal periods while on tamox, 50% have irregular periods, and 25% stop altogether.  Mine became very light and irregular; had to carry mini pads with me all the time since I couldn't predict it. A yearly transvaginal ultrasound to monitor the uterine lining and the ovaries is a good idea.

mminmich
Joined: Dec 2007
Posts: 2
Dec 3, 2007 05:51 am, edited Dec 3, 2007 05:52 AM by mminmich mminmich wrote:

I'm new to this board but I just started Tamoxifen about a month and a half ago. Before Tamoxifen, I had a period in June 07 (when I was first diagnosed with IDC), then nothing until late September 07 and that was a regular period lasting a week. Then I had another regular period in Oct 07. I started Tamoxifen Nov. 1.  Two weeks after I started the Tamoxifen, I had a very light 3 day period. Now, two weeks later again, I am having a light period again...Those of you with really sporadic periods, do they ever get more regular? I would hate to have a period twice every month but if it's this light, it might not be too bad.

amandaj
Joined: Jan 2008
Posts: 11
Feb 4, 2008 09:16 pm amandaj wrote:

I have been on tamoxifen since May 2006 but was undergoing chemo for 6 months before that.  I have not had a period in a year, but did have 2 vaginal ultrasounds since November.  My ovaries are still functioning (because there are rather large cysts and good FSH levels) but I have no signs of a period in the near future.  My gyno says that this is just how my body is reacting to everything.  She says that everyone's reaction can be different.

loria
Joined: Apr 2008
Posts: 1
Apr 23, 2008 09:14 pm loria wrote:

I have been on Tamoxifen since Feb. 06.  At first my cyle was regular for me 23 to 28 days, then 40 to 45 days.  Now I have not had a period for almost 8 months.  I am taking the med because of increased risk of breast cancer.  I was pre-menopausal going into the 5 yr program but now at almost 51 I could be in menopause.  I am told that if I go a full year without a cyle I will be able to take the blood test to determine if I am in menopause.  My diagnosis is ADH and would be very interested in hearing from someone who is also taking Tamoxifen for this reason. 

Dejaboo
Joined: Mar 2008
Posts: 567
Apr 23, 2008 09:43 pm Dejaboo wrote:

I too assumed Tamoxifen would stop ones Cycle.  I thought at least that would be nice.  I hope it doesnt make my Periods very heavy again.   I lived with that for way too many years.  When I tried birth control pills to try to lighten it..  They made it 10 times worse...(had an Endometrial Ablation- But that Only made them 'normal')


Dx 3/7/2008, IDC, <1cm, Stage I, Grade 1, 0/1 nodes, ER+/PR-
msvirgo828
Joined: May 2008
Posts: 20
May 8, 2008 08:46 pm msvirgo828 wrote:

Well i have been on Taxoxifen for 5 years and my period never stopped. Just off by a few days. Once it was quite late and had me run take a pregnancy test to be negative. My oncologist seems surprised everytime I go for my six month check up that I am still getting it. I also feel mixed because having breast cancer at 25 and on Tamoxifen is not common so I feel like a lab rat.

God doesn't give you more than you cand handle...keep your head up and hopes high.
Dx 4/30/2003, IDC, 2cm, 0/3 nodes
mistikal
Joined: May 2008
Posts: 2
May 24, 2008 09:01 am, edited May 24, 2008 09:02 AM by mistikal mistikal wrote:

I finished six cycles of FAC chemo in April 08. Now I am in week 3 of radiotherapy. I had my periods all the way through chemo, only missed this month (aged 35). I have bought a pregnancy test (just in case) as I'm seeing my oncologist in July. I'm supposed to start tamoxifen after radiotherapy. I'd still like to be able to have children afterwards but it is a bit of a 'grey'/'unknown' area. 

KP1970
Joined: Oct 2006
Posts: 108
May 25, 2008 12:44 am, edited May 25, 2008 12:45 AM by KP1970 KP1970 wrote:

I started chemo 11/06. Chemo ended 4/07, and rads ended 8/07. My last period was 1/07. I started Tamoxifen last summer and just assumed that the chemo threw me into early menopause. I didn't realize that Tamoxifen can stop periods. Well, another 5 years of no period will be just fine with me LOL

(btw, I'm 37 and from the time I started my period at 13, I have been very regular)! 

Kim
Dx 10/31/2006, IDC, 2cm, Stage IIb, Grade 3, 1/20 nodes, ER+/PR+, HER2-
ImShelle
Joined: May 2008
Posts: 20
May 30, 2008 04:01 pm ImShelle wrote:

I was on tamoxifen nearly 3 years and had my period the whole time.  My cycle was the same number of days (6-7) and was regular.  I just got off in November to start trying for a family and then I have to finish the rest of the 5 years :( 

ulla_hamsa
Joined: Sep 2007
Posts: 755
Jun 2, 2008 02:27 pm ulla_hamsa wrote:

pls sisters ..

am really confused now,,need u to tell me wat happenned with u ....

i was 34 wen diagnosed with BC last august..now 35..

i never lost my period during 6 chemo FEC ,

after the chemo finished in 25 jan.my period dissappeared for 3 months(january,february,march)

then the periods came bak in 16 april for the 1st period after chemo and rads and in may for the 2nd period after chemo and rads..

i started my tamox in 13 may and had my 1st zoladex injection in 18 may and i thought i will not have any periods after the injection and the tamoxifen..but i had my period for this month today|!!!!!!!!!!

is that normal?or it means that the tamox and the zoladex didnt work??????????

am really worried

ULLA
Dx 8/14/2007, IDC, 2cm, Stage IIIa, Grade 3, 4/27 nodes, ER+/PR+, HER2-
Eileen0417
Joined: Jun 2008
Posts: 1
Jun 22, 2008 05:17 pm Eileen0417 wrote:

Hello all, I was diagnosed at age 42. I had a period right after my second chemo. treatment(7/06) and have not had one since. It is about 2 yrs since I have had a period. I have been depressed at the idea of being menopausal, but after reading your posts, I am now thinking there could be a chance that it is my tamoxifen that is stopping my periods instead of the chemo. Are there any of you my age that lost their period for that long and got it back?

© 2008 Breastcancer.org. All rights reserved.