Trichomoniasis, sometimes referred to as "trich",'s a common cause of vaginitis. It results both from shared external water sources (hot tubs, wet bathing suits, wet towels and washcloths), and as a sexually transmitted disease (STD). It's caused by the single-celled protozoan parasite Trichomonas vaginalis. Trichomoniasis's primarily an infection of the urogenital tract; the most common site of infection's the urethra and the vagina in women. Symptoms Typically, only women experience symptoms… (More on Trichomoniasis)