Why does chlamydia cause bleeding after sex?

Chlamydia is a sexually transmitted bacterial infection. When it affects the cervix, inflammation can make the tissue sensitive and prone to bleeding during penetration. Bleeding After Sex is a common presentation of Chlamydia. Many people have few or no symptoms, and bleeding after sex can also come from other infections, cervical polyps, irritation, or hormonal changes.

Untreated chlamydia can spread into the upper reproductive tract and cause pelvic pain or other complications. Testing is the only way to identify the infection; symptoms alone cannot do so.

Arrange sexual-health testing if you have bleeding after sex, a new partner, a partner with an infection, or any concern about exposure. A urine sample or vaginal, cervical, or other swab may be used. Until a clinician gives you advice, avoid sex or use barriers, and do not share antibiotics or use leftover medicine.

If testing confirms chlamydia, take the prescribed treatment exactly as directed and follow advice about partners and follow-up. Partners may need assessment and treatment even if they feel well.

Seek urgent care for severe pelvic pain, fever, vomiting, faintness, heavy bleeding, or feeling acutely unwell. If you are pregnant or might be pregnant and have bleeding or pain, contact a clinician promptly.

Which chlamydia tests do I need? Should other sexually transmitted infections be checked? When is it safe to have sex again, and do my partners need care?