Brown leucorrhoea can be seen in the following cases: 1. Dysfunction of endocrine: commonly, luteal insufficiency or estrogen deficiency causes irregular shedding of the endometrium and brown leucorrhoea. Many patients have mid-menstrual bleeding, i.e. insufficient estrogen secretion during ovulation, endometrial shedding and brown leucorrhea; 2. endometrial lesions: such as endometritis, endometrial polyps or endometrial cancer, brown leucorrhea can also occur, which can also be manifested as irregular menstruation; 3. organic lesions: such as submucosal fibroids and tubal lesions, which can also have brown leucorrhea. Because submucosal fibroids grow in the uterine cavity, in addition to heavy menstrual flow, there is often watery brown leucorrhea, and if there are lesions in the fallopian tubes, the main symptom is vaginal fluid discharge and brown leucorrhea. With the above conditions, you should seek medical attention in time to confirm the diagnosis by doing cervical cancer screening, ultrasound and gynecological examination. Therefore, if you have brown leucorrhea, you can observe it for a short period of 1-2 months, but if it persists, you should seek medical attention promptly.