It is not normal for a girl to have brown blood in her lower body but no period. This symptom may be pregnancy, or endometrial polyps, cervical polyps or cervicitis and other diseases. 1. Pregnancy: It is recommended to go to the hospital to do a serum human chorionic gonadotropin test, if the test result is positive, then it is pregnant. At this time, brown blood in the lower body but no menstruation is considered to be a pre-eclampsia or ectopic pregnancy, it is recommended to carry out ultrasound to clarify the specific situation, under the guidance of the doctor’s treatment. 2. Endometrial polyps: generally manifested as irregular uterine bleeding, abnormal leukorrhea, abdominal pain symptoms. For example, there are cases of brown blood in the lower body but no menstruation. It is recommended to go to the hospital for examination and surgical treatment. 3. Cervical polyps or cervical inflammation: generally manifested as leukorrhea with blood, vulvar itching, contact bleeding and other symptoms. If the cervical inflammation can be in the doctor’s guidance for local drug treatment; if the cervical polyp is recommended for surgical excision treatment. If a girl has brown blood in her lower body but no menstruation, it is recommended to go to the hospital for examination to find out the cause and then treat the symptoms.