Trichomonas vaginalis is a parasite that infects the lower genital tract in both men and women, but typically causes more symptoms women. While most people with trichomonas do not experience symptoms, the infection may cause discharge from the penis or vagina, genital redness or irritation, painful urination or sex, or a burning sensation in the penis or vagina. The Healthyr trichomonas test looks for genetic material from the parasite in your urine, indicating an active infection. This type of test is able to detect trichomonas 28 days after exposure.