Some people with symptoms get them within 5 to 28 days after being infected, but others do not develop symptoms until much later. Men with trichomoniasis may feel itching or irritation inside the penis, burning after urination or ejaculation, or some discharge from the penis.
Women with trichomoniasis may notice itching, burning, redness or soreness of the genitals, discomfort with urination, or a thin discharge with an unusual smell that can be clear, white, yellowish, or greenish.
Having trichomoniasis can make it feel unpleasant to have sex.
Infected people without symptoms can still pass the infection on to others.
About 70% of infected people do not have any signs or symptoms.
When trichomoniasis does cause symptoms, they can range from mild irritation to severe inflammation.
Although symptoms of the disease vary, most women and men who have the parasite cannot tell they are infected.
Trichomoniasis is considered the most common curable STD.
In the United States, an estimated 3.7 million people have the infection, but only about 30% develop any symptoms of trichomoniasis.
Infection is more common in women than in men, and older women are more likely than younger women to have been infected.
The parasite is passed from an infected person to an uninfected person during sex.
In women, the most commonly infected part of the body is the lower genital tract (vulva, vagina, or urethra), and in men, the most commonly infected body part is the inside of the penis (urethra).
During sex, the parasite is usually transmitted from a penis to a vagina, or from a vagina to a penis, but it can also be passed from a vagina to another vagina.
It is not common for the parasite to infect other body parts, like the hands, mouth, or anus.