STIs & testing
Can you pass chlamydia if you have no symptoms?
Why chlamydia can be passed on without symptoms and how testing and partner care can break the uncertainty.
Short answer
Yes. Many people with chlamydia have no symptoms and can still pass it on through sexual contact. The only way to know your status is to test. If you have had a positive result, follow the advice from the clinician who treated you and make sure recent partners can access testing and care too.
No symptoms is common
Chlamydia can affect the genitals, rectum, or throat without causing an obvious change. Feeling normal cannot confirm that you are infection-free, and a partner feeling normal cannot confirm it either. This is why testing is a routine health step, not an accusation.
Testing should match the contact
Tell the service about oral, vaginal, or anal contact and the date it happened. That helps them choose the appropriate samples and explain if the exposure was too recent for a conclusive result.
A positive result needs a shared plan
Do not try to work out who had it first or how long it has been present. Testing cannot usually answer that. A clinician can explain treatment, when it is safer to resume sex, partner notification, and any recommended repeat test.
Reduce the chance of passing it on
Use barriers consistently or pause sex while you are arranging care, depending on the advice you receive. Partners may be able to get confidential support without a difficult conversation being forced.
Sources and further reading
- CDC: Chlamydial infections treatment guidelines (accessed August 2026)
- CDC: Getting tested for STIs (reviewed March 17, 2026)