http://www.emedicinehealth.com/trich...article_em.htm
Trichomoniasis Overview
Trichomoniasis is a sexually transmitted infection (or sexually-transmitted disease, STD) caused by a protozoan (a microscopic parasite), usually found in the vagina and urethral tissues. Although this condition is most often treated in women,
men can also be infected (and often have
no symptoms).
Trichomoniasis Symptoms
Women
Vaginal discharge
Vaginal itching
Smelly, itchy, and typically frothy or foamy discharge
Yellow or gray-green discharge
Pain with urination possible
Up to one-third of infected women have no symptoms
Men
The majority of infected men have
no symptoms
Urethral discharge
Pain with urination
Pain and swelling in the scrotum (from epididymitis)