Menstruation, which must occur every month. The periodic shedding and bleeding of the endometrium that accompanies the cyclical changes of the ovaries is called menstruation. The following is a brief description of what affects menstruation: 1. Endometrium The endometrium is the “front-line worker” of menstruation. The normal endometrium is divided into a basal layer and a functional layer. The endometrium must be normal, especially the basal layer, and damage to the basal layer for various reasons will directly lead to abnormal menstruation, such as abortion and curettage. In addition, endometrial adhesions, endometrial polyps, submucosal fibroids, uterine scar diverticula and other factors cause changes in the morphology of the endometrium, which can also cause menstrual changes. 2, ovaries The ovaries are the “top boss” of the endometrium, producing estrogen and progesterone, which act directly on the endometrium and make it change periodically, and at the same time, the ovaries also produce inhibitors, which also participate in the regulation of menstruation. It produces follicle stimulating hormone (FSH) and luteinizing hormone (LH), which directly regulate the development of ovarian follicles and ovulation, and influence the secretion of estrogen and progesterone, which indirectly affect the endometrium and menstruation. It also affects the formation of menstruation. 4, Hypothalamus The hypothalamus is the “top boss” of the pituitary gland, which produces gonadotropin releasing hormone (GnRH) in pulses, the frequency of which directly affects the LH/FSH ratio, and the change in the size of this ratio determines follicle development and ovulation. Adrenal gland The adrenal cortex is the main source of androgens in women. Small amounts of androgens are necessary for normal female pubic hair, axillary hair, muscle and whole body development, but if androgens are too high, they can inhibit the formation of gonadotropin-releasing hormone (GnRH) and counteract the effect of estrogen, thus affecting menstruation. 6. Thyroid The thyroid gland produces thyroxine (T4) and triiodothyronine (T3), which are involved in the metabolism of various substances in the body and also affect menstruation, either too little, too much, sparse, frequent, abnormal bleeding, or amenorrhea. 7, Pancreas If for some reason the pancreas produces too much insulin, forming hyperinsulinemia, it will prompt the ovaries to synthesize too much androgen, leading to menstrual disorders and even amenorrhea. 8, the brain What the brain thinks, mental stress, can have a subtle impact on menstruation, although it is a subtle impact, some times it can not be ignored, especially mental stress is too much, may directly lead to amenorrhea. 9, environment Environmental pollution, environmental changes and other circumstances, resulting in physical injury or maladjustment, may affect the menstruation. 10, diet The relationship between diet and menstruation is also very critical. Especially when you lose weight through dieting, it is easy to have low menstrual flow, push back, or even amenorrhea, while spicy diet is easy to cause high menstrual flow.