Scarlet SEX ED SUNDAY: Trichomoniasis Trichomoniasis (commonly known as 'trike' or 'trich') is an STI caused by a parasite that can cause inflammation and infection of the urethra, vagina, and cervix Burning After a Sex Toy: Friction, Yeast, or STI? Trichomoniasis (trich) is more common than you think and often goes unnoticed! About 50% or more people don't have symptoms, so you won't know you've got it until you get tested for Trichomoniasis Green Discharge Trichomoniasis (trich) is a sexually transmitted infection (STI). It is very common. Trich is easily treatable and is caused by a one celled protozoan organism called Trichomonas vaginalis. It travels from person to