How hyperthyroidism affect the menstrual cycle?As i know it will end in amenorrhea but how does it do so?

Answers:

How can i make my breasts grow faster? i am eighteen.?

I THINK (don't quote me, this is only my theory), normally at hand is thyrotropin-releasing factor (TRF) released from the hypothalamus which stimulates realese of thyroid stimulating hormone (TSH) from the pituitary --> thyroid stimulation. But TRF also stimulates prolactin release.
Increased Prolactin stimulates breast milk production, but also decreases sex hormones - hence the amenorrhoea. BUT i'm pretty sure this is the luggage for HYPOthyroidism.. as the brain is trying to stimulate the thyroid to release more.

I don't think it would take place in hyperthyroidism unless it be actually approaching a secondary hyperthyroidism, next to the primary problem being contained by the hypothalamus secreting to much TRF.

Hope this made sense.

assimilation:
This is a hard put somebody through the mill, and to be honest I don't know if my answer is right. Prolactin decreases level of oestrogen, or FSH ... something like that anyway... and that's how it would effectively incentive amenorrhoea. That's why you don't get period (or get pregnant for that matter) precipitate post-partum while you're breast feeding.
If you have an abnormal amount of prolactin, you may also catch sight of some galactorrhoea (milky nipple discharge) I guess.

I had unprotected sex finishing night?

who told you that it will mete out amenorrhea?

thryoid has nil to do with menstral cycle which are cause by other types of hormones, such as estrogen, progesterone, LH, FSH, etc; it is not caused by thryoid hormone at adjectives