Introduction

Along with gonorrhea, chlamydia is one of the most common sexually transmitted infections (STIs). It is caused by Chlamydia trachomatis bacteria, and mainly affects the mucous membrane in the cervix, urethra (urine tube), or anus. It can cause a pus-like or watery discharge as well as pain and stinging when peeing. But it is also common to have no noticeable symptoms. Then the infection may be unknowingly passed on to sexual partners.
Left untreated, the infection can lead to inflammation and scarring in the internal sex organs. That can have serious consequences, particularly for women, even if the infection happened a long time ago. Untreated chlamydia infections are one of the most common causes of infertility in women.
So it’s a good idea to get tested if you think you might have chlamydia or if you have an increased risk of infection. If you test positive, the infection can be treated effectively with antibiotics.
There are some types of chlamydia that cause illnesses that are much less common in Germany (affecting the eyes or airways, for example) and aren’t passed on through sex. This information is only about the STI.