What is the brown stuff before my period for several days?

Patient's question:

Menstruation

Doctor's answer:

Considering the symptoms may be caused by gynecological inflammatory diseases such as vaginitis or cervical erosion, it is important to promptly consider a hospital gynecological examination. Perform an ultrasound of the uterine appendages, a routine examination of vaginal discharge, and a cervical examination. Based on the results, follow the doctor's guidance to receive proper and active treatment. Pay attention to hygiene, and avoid sexual activity during the treatment period.