The condition causes an irritating discharge with associated vulvitis and vaginitis. The discharge is usually profuse, and often frothy. Vaginal pH is >4.5. Microscopic ulceration is often present on the cervix. Females may be asymptomatic, and males are usually asymptomatic.
Unlike other STIs, there is also a higher prevalence in older women in areas where trichomonas infection is prevalent and women can remain infected for some years if not treated.
It is now documented that trichomoniasis is associated with premature rupture of membranes and premature labour, as well as increased risk of HIV transmission. It can also be associated with other inflammatory conditions such as candidiasis.