20 September 2026
CareFree Kits editorial · General educational information
Chlamydia explained in plain language
Chlamydia is one of the most common STIs in the UK, and it is usually symptom-free. Here is what to look for and what to do next.
What it is Chlamydia is a bacterial infection passed on through unprotected vaginal, anal or oral sex. It is especially common in people under 25.
Signs to watch for Most people have no symptoms. When symptoms do appear they can include unusual discharge, pain when passing urine, pain in the lower stomach, bleeding between periods, or pain and swelling in the testicles.
Why it should not be ignored Left untreated, chlamydia can spread to the reproductive organs and, in some cases, affect fertility.
Testing and treatment Chlamydia is straightforward to test for and is normally treated with a short course of antibiotics prescribed by a healthcare professional. Recent partners should also be tested.
This article is general health information and does not replace professional medical advice. If you have symptoms, or a result you are unsure about, speak to a doctor, GP or sexual health clinic.