Most people with chlamydia have no symptoms at all. About 75% of infected women and 50% of infected men never develop noticeable signs, which is why chlamydia is sometimes called a “silent” infection. The only reliable way to know if you have it is to get tested.
That said, when symptoms do appear, they follow recognizable patterns depending on where the infection is located.
Symptoms in Women
Women who do develop symptoms typically notice abnormal vaginal discharge or a burning sensation when urinating. Some experience bleeding between periods, pain during sex, or lower abdominal pain. These signs can be mild enough to dismiss as a urinary tract infection or a normal variation, which is part of why so many cases go undiagnosed.
The bigger concern is what happens when chlamydia stays silent. About 10 to 15% of women with untreated chlamydia develop pelvic inflammatory disease, an infection of the uterus and fallopian tubes that can cause chronic pelvic pain, scarring, and fertility problems. This can happen without any earlier warning signs.
Symptoms in Men
Men who notice symptoms usually report discharge from the penis, burning during urination, or pain and swelling in one or both testicles (though testicular symptoms are less common). Like women, many men experience mild enough discomfort that they attribute it to something else or ignore it entirely.
Rectal and Throat Infections
Chlamydia doesn’t only infect the genitals. Anal sex can lead to a rectal infection, which may cause rectal pain, discharge, or bleeding. Oral sex can lead to a throat infection, though chlamydia in the throat rarely produces noticeable symptoms.
These infections are easy to miss because standard urine-based testing won’t detect them. If you’ve had oral or anal sex, you need to be tested at each site of contact specifically.
How Testing Works
Chlamydia testing uses a simple sample, either a urine specimen or a swab of the vagina, rectum, or throat. The lab runs a test that detects the bacteria’s genetic material, with sensitivity above 90% and specificity above 99%. This means false negatives are uncommon and false positives are extremely rare.
Timing matters. If you were recently exposed, testing too early can miss the infection. One week after exposure catches most cases. Waiting two weeks catches nearly all of them. If you test negative but were exposed within the past few days, consider retesting after the two-week mark.
At-Home Tests vs. Clinic Tests
At-home chlamydia test kits use the same lab technology as clinic-ordered tests, so the analysis itself is comparable. The difference is in sample collection. Providers know how to get an adequate swab, while people testing at home sometimes collect a sample that isn’t sufficient for accurate results. The main risk is a false negative, where the infection is present but the sample quality causes it to go undetected.
If you use a home test and get a negative result but still have reason to believe you were exposed, getting retested through a clinic is a reasonable next step. Labs connected to hospitals or public health departments also tend to have stricter quality control during the analysis process.
Who Should Get Tested Routinely
Because chlamydia so often produces no symptoms, screening guidelines exist to catch infections before they cause damage. The CDC recommends annual screening for:
- Sexually active women under 25, regardless of risk factors
- Women 25 and older with a new partner, multiple partners, a partner who has other partners, or inconsistent condom use
- All pregnant women under 25
- Men who have sex with men, at least annually at each site of contact, and every 3 to 6 months for those on PrEP, living with HIV, or with multiple partners
- People living with HIV, starting at their first evaluation and at least annually after that
- Transgender and gender diverse individuals, based on their anatomy (anyone with a cervix who is under 25 should be screened annually)
For heterosexual men at low risk, routine screening isn’t strongly recommended, though it may be offered in high-prevalence settings like STI clinics or correctional facilities.
What a Positive Result Means
Chlamydia is a bacterial infection and is curable with antibiotics. Treatment is straightforward, and most people clear the infection completely. You’ll need to avoid sex for seven days after treatment, and any recent sexual partners should be notified so they can get tested and treated too. Reinfection is common if a partner goes untreated, so the CDC recommends retesting about three months after finishing treatment.
The practical takeaway: if you’re sexually active and haven’t been tested recently, the absence of symptoms tells you very little. A simple test is the only way to know for certain.