Thyroid UK
87,426 members102,129 posts

Can increased thyroid medication affect menstrual cycle

Recently my husband and I started trying to get pregnant around the same time my endo increased my thyroid dosage from 137 to 175. My period has always been pretty regular 25 day cycles but now I'm 2 days late I also thought I experienced very minor implanantiin symptoms that went away but the pregnancy tests have been negative. I don't know if I'm pregnant or if my period is late because of the increased dosage. I have never missed a period before. I travel for work and this shift in timing is throwing everything off. I just want something to happen at this point don't care. I'd love it if I were pregnant but I doubt that's the case I just don't feel any different.

1 Reply

Sometimes, if hypo, it can also affect our fertility or menstrual cycle. Just to complicate matters. Some women have miscarriages, so you will have to be prepared and read and I believe the recommended TSH is 0.4 - 2 for pregnancy.

This is an excerpt from a previous post by Clutter:-

Hypothyroidism can cause temporary infertility but when optimally medicated you should be able to conceive. In the UK it is recommended that the TSH of women planning to conceive should be in the low normal range 0.4-2.0. TSH >2.0 can make conception difficult and increases the risk of miscarriage. Levothyroxine is usually increased by 25-50mcg when pregnancy is confirmed as the foetus is dependant on maternal hormone during the first trimester.


You may also like...