Thyroid impact on menstrual cycle

[Curious123]

Does anyone know if/how the thyroid impacts the menstrual cycle, eg cycle length (shortened vs lengthened) and flow (heavy vs lighter) depending on your thyroid function status (eg hyper versus hypo)?

Are there any research papers on this? I know TSH <2.5 is preference for conception. Just wondering overall, for example if hypothyroid, how would you expect your menstrual cycle to be impacted / change versus hyperthyroid state compared to your menstrual cycle in a euthyroid state, all other things being equal.

[Curious123]

bump

[PurpleNails Administrator]

In my experience hypothyroid levels equals shorter overall cycle, heavier longer periods. Hyperthyroid levels equals longer overall cycle, lighter, shorter periods.

However when it comes to the thyroid & menstrual cycles both like to play tricks on our bodies, when you think you understand what going on you can only predict the unexpected.