I am 32 year old. 162 cm hight and 65 kg weight. i had surgical removal of a cyst in fron of my thyroid about 8 years ago. My problem now is that i did not get my period for about 8 months! i was under stress a i started my postgraduate studies 10 months ago and i am not sure if this could be a factor for my case. I am worry that i had problem in my thyroid or even something worse related to the missed period! what would be the worst of not getting the period that long?

Summarized question: What causes amenorrhea?