A yellowish-brown discharge from the lower body can be seen in women as well as men. In women, excluding urethral or anal discharge, the most common discharge is vaginal discharge, which may be menstrual or abnormal leucorrhea. In men, in addition to anal discharge, yellowish-brown discharge from the lower body is usually abnormal semen or urine, i.e. hematospermia and hematuria. I. Women 1. Menstruation: If the menstrual flow is low or at the end of menstruation, it may appear yellowish brown due to the oxidation of iron in menstrual blood; 2. Abnormal leucorrhea: i.e. bloody leucorrhea, if it appears in the middle of menstruation, it is usually ovulatory bleeding, which is normal. If the bloody leucorrhea appears before the menstrual period, it may be luteal insufficiency. If the patient develops bloody leucorrhea along with vaginal itching and abdominal pain, it may be caused by vaginitis, cervicitis, endometritis, endometrial polyps, etc. If bloody leucorrhea occurs after sex, you need to visit a gynecologist for cervical cancer screening, which may be caused by cervical cancer. Men 1, blood semen: male semen is normally off-white or milky white, translucent milky white after liquefaction, and may be slightly yellow after a longer retention time. And yellowish-brown semen generally belongs to hematosperm, commonly in vesiculitis, patients may be accompanied by painful ejaculation, painful urination and other symptoms; 2, hematuria: yellowish-brown discharge may also be hematuria, patients may not pay attention to timely cleaning, the iron in the blood oxidation presented as yellowish-brown, commonly in kidney stones, pyelonephritis and other diseases.