The main difference between UTIs is that they are caused by different pathogens and can be distinguished by the symptoms and the tests related to the pathogens. If the UTI is caused by a bacterial infection, there are usually obvious symptoms such as frequent urination, urgency and painful urination. If the UTI is caused by a fungal infection, there may be a bean curd-like discharge from the urethra and a bad odor. Usually the symptoms can help distinguish UTIs to some extent, but to really distinguish them it is necessary to perform the appropriate pathogen testing, either by taking urine for culture or by taking urethral secretions for culture to help determine exactly which pathogen is responsible for the UTI. The actual UTIs are usually a lot more than just a few of the most popular ones.