References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
A trichomoniasis diagnosis doesn’t automatically mean someone has been unfaithful. Trichomoniasis can be asymptomatic for months or even years. Either partner may have been carrying it from before the relationship without knowing. The infection can persist silently until something triggers symptoms or until routine testing picks it up.
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Why Trich Can Appear Without Cheating
| Reason | Explanation |
|---|---|
| Asymptomatic carriage | Up to 50% of cases have no symptoms |
| Long dormancy | Can persist for months or years without symptoms |
| Previous partner | May have been acquired before the current relationship |
| Late testing | Not always included in routine STI screens |
What to Do
- Both partners should be tested and treated
- Discuss honestly but without assuming blame
- Understand that timing of infection can be uncertain
- Complete treatment and avoid sex until both have finished
Communication
A new STI diagnosis in a long-term relationship can be stressful. Before jumping to conclusions, consider that silent infections can persist for years. Your sexual health clinic can help with information and support.
Read more: What is trichomoniasis? | STIs and relationships | STIs from asymptomatic partners
Frequently Asked Questions
How long can trichomoniasis be dormant?
Months to years in some cases.
Does a diagnosis prove infidelity?
No — asymptomatic carriage is common.
Should we both be treated even if one tests negative?
Usually yes — to prevent reinfection.
Related reading
- Can You Catch an STI From a Toilet Seat?
- Can You Get Chlamydia From Kissing?
- Can You Get Herpes From a Toilet Seat?
- Can You Get Herpes From Kissing?
- Can You Catch Syphilis Without Having Sex?
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
