The honest answer is that most people with chlamydia don’t know they have it. About 75% of women and 50% of men with the infection have no symptoms at all, which is why routine testing is the only reliable way to find out. When symptoms do appear, they tend to be mild and easy to dismiss as something else.
Why You Probably Won’t Feel Symptoms
Chlamydia is often called a “silent” infection because it causes no obvious signs in the majority of people who carry it. You can have it for weeks, months, or even longer without anything feeling off. This doesn’t mean the infection is harmless. It can quietly damage reproductive tissue the entire time it goes undetected, which is why screening matters even when you feel perfectly fine.
When symptoms do show up, they typically appear one to three weeks after exposure, though the incubation period can stretch to several months in some cases. The unpredictable timing makes it difficult to connect symptoms to a specific sexual encounter.
Symptoms in Women
Women who do notice something are most likely to experience abnormal vaginal discharge or a burning feeling when urinating. You might also notice bleeding between periods, a smelly discharge, or an unusual sore. Some women develop lower abdominal or pelvic pain, which can signal that the infection has moved deeper into the reproductive tract.
These symptoms overlap with urinary tract infections, yeast infections, and bacterial vaginosis, so it’s common to assume it’s one of those instead. A burning sensation when you pee, in particular, gets chalked up to a UTI more often than it should. If you’re sexually active and experiencing any of these, testing for chlamydia is worth doing even if another explanation seems more likely.
Symptoms in Men
Men who develop symptoms typically notice a discharge from the penis, burning during urination, or pain and swelling in one or both testicles. The discharge can be clear, white, or slightly cloudy, and it may only appear in the morning. Testicular pain is less common but signals that the infection has spread to the tube that carries sperm, which can affect fertility if left untreated.
As with women, these symptoms are easy to write off. A mild burning sensation or slight discharge might not seem urgent enough to warrant a clinic visit, but even subtle symptoms are worth investigating.
Rectal and Throat Infections
Chlamydia can also infect the rectum and throat through anal or oral sex. A rectal infection may cause pain, discharge, or bleeding, but it often causes nothing at all. Throat infections are almost always symptom-free. These sites are frequently missed because many people don’t think to mention anal or oral exposure, and standard urine tests won’t catch infections at those locations.
The Only Way to Know for Sure: Testing
Because symptoms are unreliable, a lab test is the only definitive way to know your status. The standard test uses a technology that detects the bacteria’s genetic material with high accuracy. These tests pick up about 94% of true infections, with virtually no false positives. That holds whether the sample comes from urine, a vaginal swab, or a rectal swab.
You can be tested at a doctor’s office, a sexual health clinic, or with an at-home kit. Self-collected vaginal swabs have been shown to match the accuracy of samples collected by a clinician, with one validation study finding identical results between the two methods. For men, a urine sample is typically all that’s needed. If you’ve had receptive anal sex, ask specifically for a rectal swab, since a urine test won’t detect an infection there.
Timing matters. If you think you were exposed recently, waiting at least seven days before testing gives the bacteria enough time to reach detectable levels. Testing earlier than that risks a false negative. Some guidelines suggest waiting up to two weeks for the most reliable result.
Who Should Get Screened Routinely
The CDC recommends annual chlamydia screening for all sexually active women under 25, regardless of symptoms or condom use. Women 25 and older should be screened if they have new or multiple partners, or other risk factors. Pregnant women under 25 should be tested during pregnancy and again in the third trimester.
For men who have sex with men, annual screening at all sites of sexual contact is recommended. Men on PrEP, those living with HIV, or those with multiple partners should consider testing every three to six months. For heterosexual men, routine screening isn’t broadly recommended, but it’s encouraged in high-prevalence settings like STI clinics or correctional facilities.
Transgender and gender-diverse individuals should follow screening guidelines based on their anatomy. Anyone with a cervix who is under 25 and sexually active should be screened annually, for instance, regardless of gender identity.
If you test positive and get treated, you should be retested about three months later. Reinfection is common, often because a partner wasn’t treated at the same time.
What Happens If It Goes Untreated
Chlamydia is easily curable with antibiotics, but leaving it untreated can cause serious damage. In women, the infection can spread to the uterus, fallopian tubes, and ovaries, causing pelvic inflammatory disease. Between 10% and 20% of women with untreated chlamydia develop this condition. PID can lead to chronic pelvic pain, difficulty getting pregnant, and ectopic pregnancy, where a fertilized egg implants outside the uterus. Ectopic pregnancies are medical emergencies.
In men, untreated chlamydia can cause inflammation of the tube near the testicle, leading to pain and, in rare cases, reduced fertility. For both sexes, having chlamydia also increases vulnerability to other sexually transmitted infections, including HIV.
The damage from untreated chlamydia is often irreversible. Scarring in the fallopian tubes, for example, doesn’t heal after the infection is cleared. This is why catching it early through screening is far more effective than waiting for symptoms that may never come.