If leucorrhea is brown, it is often related to the following factors: 1. The most common factor is the irregular shedding of endometrium caused by endocrine disorders, which makes leucorrhea brown, such as luteal function and estrogen deficiency, which may lead to irregular shedding of endometrium and brown leucorrhea. 2. Due to endometrial lesions, such as endometrial polyps, endometrial inflammation, endometrial cancer, endometrial atypical hyperplasia, etc., leucorrhea is brown. 3, due to organic lesions, such as submucous myoma of uterus or pelvic tumors, it will affect brown leucorrhea, and then cervical lesions, such as cervical cancer, chronic cervical inflammation and vaginal inflammation, will lead to brown leucorrhea. Therefore, once the leucorrhea is found to be brown, a detailed gynecological examination must be done, and cervical cancer screening and B-ultrasound examination are recommended.