The fishy odor of leukorrhea is mainly due to the following reasons: 1. There is a large amount of anaerobic bacterial infection in the vagina, which will lead to an inflammatory reaction, and this inflammatory reaction will be characterized by a great fishy odor. 2. Because of cancer of the cervix or endometrium, when the cancerous tissue becomes necrotic, it will also release a large amount of foul-smelling secretions. So when there is inflammation in the vagina or cancer in the cervix or endometrium, there will be a big fishy smell or foul odor in the leukorrhea. It is recommended to go to the hospital in time for examination, and do routine white belt test, cervical cancer screening and ultrasound examination to understand whether there are local lesions through the examination, and treat with medicine or surgery according to the result.