Trichomoniasis What Is Trichomoniasis? Trichomoniasis—often called “trich” —is a common sexually transmitted infection (STI) caused by a microscopic parasite. This infection is caused by a single-celled protozoan that spreads from person to person during sexual contact. What makes trichomoniasis especially tricky is that about 70% of people infected have no symptoms at all , meaning it can easily go unnoticed and unknowingly spread. ⏳ When Do Symptoms Appear? If symptoms do
