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 chlamydia is often called a “silent” infection. When symptoms do appear, they typically show up several weeks after exposure. The only reliable way to know for sure is to get tested.
Symptoms in Women
The minority of women who do experience symptoms may notice abnormal vaginal discharge, bleeding between periods, or bleeding after sex. Pain or burning during urination is common, and some women develop lower abdominal or pelvic pain. These symptoms overlap with urinary tract infections, yeast infections, and bacterial vaginosis, which makes chlamydia easy to misidentify or dismiss without a test.
Symptoms in Men
Men who develop symptoms typically notice a discharge from the penis, which can range from clear and watery to thicker and cloudy. Burning or pain during urination is another hallmark sign. The opening of the urethra at the tip of the penis may become red, swollen, or itchy. In some cases, one or both testicles become swollen and tender, a sign the infection has spread to the epididymis (the tube behind each testicle that stores sperm).
Rectal and Throat Infections
Chlamydia can also infect the rectum and throat through anal or oral sex. Rectal chlamydia may cause pain, discharge, or bleeding, but it’s frequently asymptomatic. Throat infections rarely produce noticeable symptoms. Because these infections are easy to miss, testing at the specific site of exposure matters. A standard urine test won’t detect an infection in your throat or rectum.
Why You Can’t Rely on Symptoms Alone
The high rate of silent infections is what makes chlamydia dangerous. You can carry the bacteria for months or even years without any sign something is wrong, all while passing it to sexual partners. When symptoms do show up, they can be mild enough to ignore or attribute to something else. A partner’s positive test result, a routine screening, or a new sexual relationship are all valid reasons to get tested even when you feel completely fine.
How Testing Works
The standard chlamydia test is a nucleic acid amplification test, or NAAT. It detects genetic material from the bacteria and is extremely sensitive, picking up 20% to 50% more infections than older testing methods. For women, a vaginal swab is the preferred specimen and performs just as well whether you collect it yourself or a clinician does it. For men, a urine sample works as well as or better than a urethral swab.
If you’ve had anal or oral sex, let your provider know so they can test those sites separately with a rectal or throat swab. These use the same NAAT technology and are the recommended approach for detecting infections outside the genital tract.
Timing matters. The test is reliable for most people about one week after exposure, and waiting two weeks catches nearly all infections. Testing too early can produce a false negative.
Who Should Get Screened Routinely
National guidelines recommend annual chlamydia screening for all sexually active women aged 24 and younger, and for older women with risk factors like a new partner, multiple partners, or a partner with a known infection. The CDC also recommends annual screening for men who have sex with men, with more frequent testing if they or their partners have multiple partners.
For men who have sex with women, there isn’t a blanket screening recommendation, but testing is appropriate anytime you have symptoms, a partner tests positive, or you have a new sexual partner and want to be sure of your status.
What Happens If It Goes Untreated
Chlamydia is easily curable, but the damage from a long-standing untreated infection is not reversible. In women, the biggest risk is pelvic inflammatory disease (PID), a serious infection of the uterus, fallopian tubes, and ovaries. Between 10% and 20% of women with untreated chlamydia develop PID, and 1 in 8 women with a history of PID have difficulty getting pregnant. PID can also cause chronic pelvic pain and ectopic pregnancy, where a fertilized egg implants outside the uterus.
In men, untreated chlamydia can lead to inflammation of the prostate gland, scarring of the urethra, inflammation of the epididymis, and in some cases infertility.
Treatment and Follow-Up
Chlamydia is treated with a seven-day course of oral antibiotics. Most people clear the infection completely with this regimen. You don’t need a repeat test to confirm the infection is gone unless your symptoms persist or there’s concern about reinfection. However, you should get retested about three months after treatment, because reinfection from an untreated partner is common. If three months isn’t possible, retest anytime within the following year.
One important note on timing: avoid retesting sooner than four weeks after finishing treatment. The test is sensitive enough to detect remnants of dead bacteria, which can trigger a false positive even after the infection has cleared.