If a woman’s discharge smells bad, the most common cause is a dysbiosis of the vaginal flora caused by a decrease in resistance, leading to anaerobic bacterial infections and bacterial vaginosis. The main characteristic of the discharge is that it is thin and has a fishy odor, and treatment with metronidazole or tinidazole is recommended. During the treatment period, you should not have sexual intercourse, drink alcohol and eat spicy and acidic food. Also do not eat seafood, so as to help the disease heal as soon as possible. If the discharge has a bad smell, it is also seen in cervical cancer and endometrial cancer. Therefore, it is recommended that women should have a gynecological examination every year to find out whether there is inflammation or malignant tumor, and have cervical cancer screening and ultrasound examination every year.