Why do my periods stop for two months at a time?

Hormonal. Periods are controlled by a delicate hormonal system. If one ovulates usually the periods will be normal. If there is an imbalance in the female hormonal ( fsh-lh-pituitary-adrenal-thyroid) system, then there may be problems with this cycle. You may have a condition known as pcp (polycystic ovarian syndrome). You should make sure you are up to date on your yearly exams and if problems, gyn!