Trichomoniasis is a common STI caused by a one-celled protozoan parasite. In women, trichomoniasis can cause a foul-smelling vaginal discharge, genital itching and painful urination.
A physical exam and lab tests can be used to diagnose trichomoniasis. Your doctor may look at a sample of your vaginal fluid under a microscope to look for evidence of the parasite. Trichomoniasis is treatable with antibiotics. Speak with your doctor about treatment options.