Trichomoniasis is one of the most common sexually transmitted infections (STIs) in Canada. It is caused by a tiny parasite and can affect people of any age or background. This article explains what trichomoniasis is, how it spreads, what symptoms to watch for, and how it is treated. Understanding this infection can help you protect your health and the health of your partner.
What Is Trichomoniasis?
Trichomoniasis is a vaginal infection caused by a microscopic parasite called Trichomonas vaginalis. It belongs to a group of infections known as vulvovaginitis — infections that affect the vulva and vagina at the same time. In fact, vulvar and vaginal infections almost never occur in isolation. They tend to develop together, which is why doctors treat them as one condition.
Trichomoniasis accounts for roughly 20% of all vulvovaginal infections. It is more common than many people realize. According to the World Health Organization’s STI fact sheet, millions of new trichomoniasis cases occur worldwide every year.
How Does Trichomoniasis Spread?
The primary way trichomoniasis spreads is through sexual contact. The parasite passes from one person to another during unprotected vaginal sex. It is important to know that an infected person may not show any symptoms at all. As a result, they can unknowingly pass the infection to a partner.
Non-sexual transmission is extremely rare. In exceptional cases, a mother can pass the parasite to her newborn during delivery. Transmission through shared towels or toilet seats is theoretically possible but very uncommon. For all practical purposes, sexual contact is the route of infection you need to be aware of.
Who Is at Risk?
Anyone who is sexually active can get trichomoniasis. However, your risk is higher if you have multiple sexual partners or do not use barrier protection consistently. People who have had other STIs in the past may also face a higher risk. If you are sexually active and have concerns, speaking with your family doctor or visiting a walk-in clinic for testing is a smart step.
Recognizing the Symptoms of Trichomoniasis
Symptoms of trichomoniasis can vary from person to person. Some people have no symptoms at all, while others experience significant discomfort. Knowing the warning signs can help you seek care sooner.
Vaginal Discharge Changes
One of the most recognizable signs of trichomoniasis is a change in vaginal discharge. The discharge is typically abundant, grey-green in colour, and frothy or foamy in texture. It may also have an unpleasant odour. This discharge can become more noticeable after a menstrual period.
It is worth noting what normal discharge looks like. Normal vaginal discharge tends to be whitish, thick, and quite acidic. Discharge linked to a trichomoniasis infection, however, is often less acidic, sometimes slightly alkaline, and may appear yellowish or greenish.
Other Common Symptoms
Beyond discharge changes, trichomoniasis can cause a range of uncomfortable symptoms. These include:
Vaginal itching or burning — persistent irritation inside or around the vagina
Redness and swelling — the vaginal walls may become red and inflamed
Pain during sex — known as dyspareunia, this discomfort is caused by vaginal inflammation
Painful or frequent urination — a burning sensation when urinating or needing to urinate often
Pelvic discomfort — a general aching or pressure in the lower pelvic region
In some cases, the infection may also cause general symptoms such as fatigue or a low-grade fever. These signs suggest the body is working hard to fight the infection. Furthermore, swollen lymph nodes in the groin area may occasionally appear.
Getting a Diagnosis
Diagnosing trichomoniasis requires more than just describing your symptoms. A healthcare provider will take a full health history and perform a gynaecological examination. This helps rule out other causes of vaginal infection, such as bacterial vaginosis or a yeast infection.
What to Expect During Your Appointment
Your doctor will ask about when your symptoms started and what your discharge looks, smells, and feels like. They will also ask whether your symptoms change throughout your menstrual cycle. It is helpful to mention any recent sexual contact, recent antibiotic use, or any other medications you have been taking.
The physical examination should ideally take place outside of your menstrual period. Your doctor will ask you not to douche or use vaginal products for at least 12 hours before the visit. A swab of vaginal discharge is then sent to a lab for bacterial and parasitic analysis. This test confirms the specific cause of your infection.
Ruling Out Other Infections
Because several infections share similar symptoms, your doctor may test for more than one condition at the same time. For example, a yeast infection (candidiasis) and trichomoniasis can both cause itching and discharge. However, a yeast infection typically produces thick, white, cottage-cheese-like discharge, while trichomoniasis produces thin, frothy, greenish discharge. A lab test gives a clear and accurate answer.
Your provider may also examine your skin for any rashes or signs of a fungal infection that has spread. This helps build a complete picture of your reproductive health. According to Mayo Clinic’s overview of trichomoniasis, many people with this infection are completely unaware they have it.
Treatment for Trichomoniasis
The good news is that trichomoniasis is very treatable. With the right medication, most people recover fully and quickly. Treatment has three main goals: destroy the parasite, restore healthy vaginal conditions, and prevent reinfection.
Step 1 — Antiparasitic Medication
Your doctor will prescribe an antiparasitic medication to eliminate the Trichomonas vaginalis parasite. The most commonly used medications are metronidazole or tinidazole, both taken orally. These are available through a prescription from your family doctor or a walk-in clinic. Your provincial health plan may cover the cost, depending on your province.
To help ensure the infection is fully cleared, your doctor may recommend a follow-up treatment three to four weeks after the first round. This reduces the chance of the infection returning. It is very important to complete the full course of medication, even if your symptoms improve quickly.
Step 2 — Restoring Vaginal Health
After antiparasitic treatment, your doctor may suggest steps to restore the natural acidity of your vaginal environment. Using a mildly acidic soap for external hygiene can help. Avoid douching, scented products, and anything that might disrupt your vaginal flora further. A healthy vaginal pH acts as a natural defence against infection.
Step 3 — Treating Your Partner
This step is critical. Your sexual partner must also be tested and treated, even if they have no symptoms. A partner who carries the parasite without symptoms is called an asymptomatic carrier. If your partner is not treated at the same time, you risk becoming reinfected after you recover. Both partners should avoid sexual contact until treatment is complete and symptoms have fully resolved.
When to See a Doctor
If you notice any unusual changes in vaginal discharge, persistent itching, burning, or pain during sex, do not wait. These symptoms deserve a proper medical evaluation. Trichomoniasis does not go away on its own, and leaving it untreated can increase your risk of acquiring other STIs, including HIV.
You can book an appointment with your family doctor or visit your nearest walk-in clinic. Sexual health clinics, available in most Canadian cities and towns, are another excellent and confidential resource. Many provinces also offer free or low-cost STI testing through public health units. Visit Health Canada’s official health resources to find services near you.
Always consult a qualified healthcare provider before starting any treatment. Self-diagnosing or using over-the-counter products without a confirmed diagnosis can make symptoms worse or mask a more serious condition.
Preventing Trichomoniasis
Prevention is always better than treatment. Fortunately, there are straightforward steps you can take to reduce your risk of trichomoniasis and other STIs.
Use condoms consistently — barrier protection significantly lowers the risk of transmission during vaginal sex
Limit sexual partners — fewer partners means lower exposure risk
Get tested regularly — routine STI screening is recommended for sexually active adults, especially if you have new or multiple partners
Talk openly with partners — honest conversations about sexual health protect everyone involved
Avoid sharing personal items — towels and underwear should not be shared, even if the risk through these routes is low
Regular testing is especially important because trichomoniasis often causes no symptoms. Therefore, the only way to know for sure is to get tested. Many Canadian public health units offer free or subsidized STI testing as part of provincial health programmes.
Frequently Asked Questions About Trichomoniasis
Can trichomoniasis go away on its own without treatment?
No, trichomoniasis does not typically clear up on its own. Without treatment, the infection can persist for months or even years. It is important to see a doctor and complete a full course of antiparasitic medication to fully eliminate the parasite.
How soon do trichomoniasis symptoms appear after infection?
Symptoms of trichomoniasis can appear anywhere from five to 28 days after exposure. However, many people — especially men — never develop noticeable symptoms at all. This is why regular STI testing is so important for sexually active Canadians.
Can I get trichomoniasis from a toilet seat or swimming pool?
Transmission of trichomoniasis through toilet seats, pools, or shared objects is extremely rare. The parasite does not survive long outside the human body. Sexual contact remains the primary and most significant route of transmission.
Does trichomoniasis affect men differently than women?
Yes, trichomoniasis tends to cause more noticeable symptoms in women than in men. Men infected with trichomoniasis are often asymptomatic, meaning they carry and spread the parasite without knowing it. Both partners must be tested and treated at the same time to prevent reinfection.
Is trichomoniasis covered under provincial health plans in Canada?
Testing for trichomoniasis is generally covered under provincial and territorial health plans when ordered by a doctor. Prescription medication costs may also be partially or fully covered depending on your province and drug benefit programme. Check with your family doctor or provincial health authority for details specific to your region.
Can trichomoniasis cause complications if left untreated?
Yes, untreated trichomoniasis can lead to complications. It increases your vulnerability to other STIs, including HIV, and may contribute to pelvic inflammatory disease in some cases. During pregnancy, it has also been linked to premature birth and low birth weight, which is why prompt treatment is so important.
Key Takeaways
Trichomoniasis is a common and treatable STI caused by the parasite Trichomonas vaginalis.
It spreads almost exclusively through sexual contact.
Symptoms include frothy grey-green discharge, itching, burning, and pain during sex — but many people have no symptoms at all.
Diagnosis requires a lab test on a vaginal swab — symptoms alone are not enough to confirm the infection.
Treatment involves antiparasitic medication for both you and your partner at the same time.
Without treating your partner, reinfection is likely.
Regular STI testing is an important part of sexual health care for all sexually active Canadians.
If you have concerns, speak with your family doctor, walk-in clinic, or local sexual health centre as soon as possible.
