In the exclusion of no pregnancy, three months did not come called secondary amenorrhea, there are the following reasons: 1, consider the existence of previous uterine operations, such as abortion surgery will have excessive impact on the endothelium, causing uterine adhesions and cervical adhesions, which will lead to endothelial damage to produce amenorrhea. 2, the emergence of early-onset ovarian insufficiency, because some women are overly dieting to lose weight, which affects 3, and endocrine hormone diseases have a certain relationship, because there will be a part of the female polycystic ovary syndrome, hyperprolactinemia, will appear obese, hairy, infertility or even no dominant follicles, will cause amenorrhea for a longer time. 4, and the hypothalamus pituitary ovary diseases have a little relationship, such as pituitary tumors, we must carry out a CT examination to rule out the existence of the cause of this. The reason for this is that there is no reason for it to be present in the pituitary gland.