What is Chlamydia? Chlamydia is a common sexually transmitted infection (STI) caused by bacteria. People who have chlamydia often don’t have outward symptoms in the early stages. Women can get chlamydia in the cervix, rectum, or throat. Men can get chlamydia in the urethra (inside the penis), rectum, or throat. Chlamydia is a common STD […]