Fishy odor of discharge in late pregnancy may be related to trichomonas vaginitis and bacterial vaginosis. 1. Trichomonas vaginitis: It may be due to sharing bath towels and toilet seats with Trichomonas parasites, etc., and the infected Trichomonas multiplies in the vagina, causing increased vaginal discharge, vulvar itching, etc., accompanied by a foul smell. 2. Bacterial vaginosis: mostly due to the imbalance of vaginal microecology, other bacteria multiply in large quantities, such as bacillus-like bacteria, Prevotella and so on. This leads to an increase in vaginal discharge and the discharge has a fishy odor. When abnormal vaginal discharge occurs, it is recommended to consult a doctor in time and treat with medication according to the examination results, so as not to cause premature rupture of membranes, intrauterine infection and so on. Pay attention to the cleanliness and hygiene of the vulva and wear loose cotton underwear. Conduct regular pregnancy checkups.