Most people with chlamydia have no symptoms at all. Roughly 75% of women and 50% of men who are infected never notice anything wrong, which is why chlamydia is often called a “silent” infection. When symptoms do appear, they typically show up one to three weeks after exposure, though they can take longer. The specific signs depend on where the infection is located and whether you have a penis or a vagina.
Symptoms in Women
When chlamydia does cause symptoms in women, they tend to be mild and easy to mistake for a urinary tract infection or vaginal irritation. The two most common signs are abnormal vaginal discharge and a burning sensation when peeing. The discharge may look different from your normal discharge in color, consistency, or smell.
Some women also notice bleeding between periods or after sex. Pain during intercourse is another possible sign. These symptoms can come on gradually, making them easy to dismiss. Even without any noticeable symptoms, the infection can silently damage the reproductive system, which is why routine screening matters.
Symptoms in Men
Men are somewhat more likely to notice symptoms than women, though half still have no signs at all. The most recognizable symptom is a discharge from the penis, which can be clear, white, or slightly cloudy. Burning or pain during urination is also common.
Other signs include redness, swelling, or itching at the tip of the penis. Some men develop swelling and tenderness in one or both testicles, which can signal that the infection has spread deeper into the reproductive tract. Testicular symptoms in particular shouldn’t be ignored, as they may indicate a complication called epididymitis (inflammation of the tube that stores sperm).
Rectal and Throat Infections
Chlamydia doesn’t only infect the genitals. It can also be transmitted to the rectum through anal sex or, less commonly, by spreading from a vaginal infection. Rectal chlamydia may cause pain, discharge, or bleeding from the rectum, but it’s frequently asymptomatic.
Throat infections from oral sex are also possible. These rarely cause noticeable symptoms, and when they do, a mild sore throat is the most common complaint. Because these infections are so often silent, they can go undiagnosed unless you specifically ask for testing at those sites.
Eye Infections
Chlamydia can infect the eyes if bacteria are transferred from the genitals to the eye, usually by touch. This causes a condition called chlamydial conjunctivitis. Symptoms include red or pink eyes, mucous or pus-like discharge, crusting of the lashes, swollen lids, tearing, sensitivity to light, and a gritty foreign-body sensation. The lids may feel “glued together” in the morning. Unlike typical pink eye, chlamydial conjunctivitis tends to last for weeks rather than days and won’t resolve with standard eye drops.
What Happens If It Goes Untreated
Because chlamydia so often flies under the radar, untreated infections can cause real damage over time. In women, the biggest concern is pelvic inflammatory disease (PID), an infection of the uterus, fallopian tubes, or ovaries. PID can develop within days to weeks of the initial infection. Its symptoms include pain or tenderness in the lower abdomen, fever, and chills. About 20% of people who develop PID go on to have chronic pelvic pain. PID can also cause scarring in the fallopian tubes, leading to difficulty getting pregnant or a higher risk of ectopic pregnancy.
In men, untreated chlamydia can spread to the epididymis, the coiled tube behind each testicle. This causes one-sided testicular pain, swelling, and tenderness that can come on quickly. The spermatic cord may also become swollen and painful. While epididymitis is treatable, repeated infections can potentially affect fertility.
Why Most People Need Testing, Not Symptoms
Given that the majority of chlamydia infections produce no symptoms, waiting for something to feel wrong is not a reliable strategy. A simple test can detect the infection with high accuracy. The preferred method uses a urine sample for men and a vaginal swab for women. Self-collected vaginal swabs are just as accurate as those collected by a clinician, so many testing options now let you collect your own sample at a clinic or even at home.
For men, a urine sample performs as well as, or better than, a urethral swab. For women, urine testing is acceptable but may miss up to 10% of infections compared to a vaginal swab, so a swab is generally the better choice.
Current guidelines from the World Health Organization recommend targeted screening for sexually active adolescents and young adults (ages 10 to 24), pregnant women, sex workers, and men who have sex with men. For higher-risk groups, screening every 6 to 12 months is recommended. If you’ve had a new sexual partner or unprotected sex, testing is the only reliable way to know your status, whether or not you have symptoms.