The causes of rotten egg smell in leukorrhea are as follows: 1. Clinically, most of them are caused by bacterial vaginosis caused by anaerobic bacterial infection, which is manifested by rotten egg-like odor of vaginal discharge and increased vaginal discharge, which can be treated with metronidazole suppositories. 2. If leukorrhea smells like rotten egg, it is also necessary to exclude the possibility of cervical cancer, as necrosis of cancerous tissues leads to foul odor of the discharge. It is recommended to do gynecological examination to find out whether there are cervical redundancies and cervical cancer screening. 3. It is recommended to do ultrasound examination to rule out the possibility of endometrial lesions because when endometrial cancer is combined with infection, vaginal discharge has a foul odor.