Generally low menstrual flow may lead to endometrial thickening. However, endometrial thickening may also be caused by other reasons and patients are advised to seek medical attention to clarify the cause. Chronic low menstrual flow may trigger thickening of the endometrial lining because the amount of menstrual flow is related to the level of androgens, which may be caused by increased levels of androgens and low levels of progesterone. Therefore, when endometrial thickening triggers low menstrual flow, the patient needs to rule out episodic endometrial pathology, as persistent androgens may trigger endometrial hyperplasia, leading to endometrial pathology. If this happens, the patient needs to observe the pathology of the endometrium and treat according to the pathology. In addition, there are various reasons for low menstrual flow, such as excessive fat loss, emotional instability, irregular menstruation, polycystic ovary syndrome and so on. It is recommended to consult a doctor in time, complete the relevant examinations to confirm the cause of the disease, and early treatment and early recovery.