👉 Trichomoniasis, also known as Trichomonas vaginalis, is a sexually transmitted infection (STI) that can cause inflammation and swelling of the vagina. It is caused by the bacteria Trichomonas vaginalis, which is often found in warm, moist environments such as shower stalls, public restrooms, and sexual activity with someone who has the infection. Trichomoniasis can be spread through contact with an infected person's urine or semen, through contaminated clothing or