Published on Jul 20, 2023 | 10:20 AM
Trichomoniasis (often called “trich”) is a common sexually transmitted infection (STI) caused by a parasite called Trichomonas vaginalis. It is one of the most common curable STIs worldwide, yet it frequently goes undiagnosed because many people have mild or no symptoms.
Trichomoniasis primarily affects the vagina and urethra, but it can also infect the penis. When diagnosed, it is easily treated with prescription medication.
Symptoms may appear 5–28 days after exposure, though many people remain asymptomatic.
Common symptoms include:
In women
Vaginal discharge (often yellow-green, frothy, or foul-smelling)
Vaginal itching or irritation
Pain or burning during urination
Pain during sex
Vulvar redness or swelling
In men
Mild penile discharge
Burning during urination or ejaculation
Itching or irritation inside the penis
Because symptoms can be subtle or absent, testing is the only reliable way to confirm infection.
Trichomoniasis spreads through:
Vaginal sex
Genital-to-genital contact
It is less commonly transmitted through oral or anal sex, but transmission can occur even when no symptoms are present.
Diagnosis is made using laboratory testing, which may include:
Vaginal swab testing
Urine testing
Rapid antigen tests or NAAT testing
Routine STI screening may not always include trichomoniasis unless symptoms or risk factors are present, making targeted testing important.
Trichomoniasis is curable with prescription medication.
Standard treatment includes:
Metronidazole
Tinidazole
Treatment notes:
Medication may be given as a single dose or short course
Avoid alcohol during treatment and for 24–72 hours afterward
Sexual partners must be treated at the same time
Avoid sexual activity until treatment is complete and symptoms resolve
Retesting may be recommended in some cases
Untreated trichomoniasis can increase the risk of:
Pelvic inflammatory disease (PID)
Pregnancy complications (preterm delivery, low birth weight)
Increased susceptibility to HIV
Ongoing genital irritation and discomfort
Early diagnosis and treatment significantly reduce these risks.
CallOnDoc provides confidential, judgment-free trichomoniasis care online.
With a virtual visit, you can:
Discuss symptoms or exposure with a licensed provider
Receive appropriate prescription treatment when indicated
Avoid in-person clinic wait times
Access discreet care quickly
Healthcare that fits your life — not your calendar.
updated 1/23/2026 Shelly House, FNP, is a Family Nurse Practitioner and Call-On-Doc’s trusted medical education voice. With extensive experience in telehealth and patient-centered care, Ms. House is dedicated to making complex health topics simple and accessible. Through evidence-based content, provider collaboration, and a passion for empowering patients, her mission is to break down barriers to healthcare by delivering clear, compassionate, and practical medical guidance.
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