Normal leucorrhoea does not have a fishy smell. When stimulated by factors such as inflammation or tumours in the reproductive tract, it can have an unpleasant abnormal smell. The abnormal smell of the leucorrhoea mainly refers to fishy and foul smells. For example, the leucorrhoea of patients with bacterial vaginosis may smell fishy, and the leucorrhoea of patients with Neisseria gonorrhoeae vaginitis or advanced cervical cancer may smell foul.