Unlike most sexually transmitted diseases, trichomoniasis is caused by a parasite rather than by bacteria or a virus. The trichomoniasis parasite can be present in the vagina for years without causing symptoms. If they do occur, typical symptoms for women include vaginal itching and burning, a greenish-yellow vaginal discharge, and burning or pain when urinating.
Sexual intercourse can be painful.
In men, symptoms include mild itching and irritation of the penis, pain during intercourse and discomfort when urinating. Men who have trichomoniasis usually don't experience any symptoms. This may infect their sexual partners and not know it. Trichomoniasis is diagnosed by examining a drop of vaginal fluid under a microscope. If you're a woman, don't take this drug during the first three months of pregnancy.