What Is Chlamydia? Symptoms, Signs and Discharge

Chlamydia is one of the most reported bacterial sexually transmitted infections on the planet. Annually, the World Health Organization projects 128.5 million new diagnoses in adults between 15 and 49. However, the majority of carriers are unaware of their condition.

Here’s what you need to know about what chlamydia is especially if you’re thinking about getting tested. Understand the symptoms of chlamydia, variations between sexes, transmission, potential for long-term harm, and the subsequent steps.

What Is Chlamydia?

Chlamydia is a bacterial infection caused by Chlamydia trachomatis. It spreads through vaginal, anal, and oral sex, and it can infect the cervix, urethra, rectum, throat, and eyes.

What makes it especially difficult to catch early is how quiet it is. According to the European Centre for Disease Prevention and Control, at least 70% of women and 50% of men are completely asymptomatic at the time of diagnosis, which is why chlamydia is often called a “silent” infection.

Typically, the infection remains in the lower genital tract. However, if left untreated, it can move up into the upper reproductive system. This can lead to pelvic inflammatory disease (PID), a more severe condition associated with persistent pain and infertility.

Chlamydia Symptoms and Early Signs

When signs of chlamydia do appear, they typically show up one to three weeks after exposure. The general picture includes abnormal discharge, burning during urination, pelvic or testicular discomfort, and bleeding between periods. 

However, many people remain symptom-free for months, which makes testing a lot more important than symptom-watching. This goes beyond chlamydia and applies to other STDs like gonorrhea and HIV as well.

Symptoms of Chlamydia in Women

Women may notice changes in vaginal discharge, painful urination that is sometimes misdiagnosed as a urinary tract infection, discomfort during sex, or dull lower abdominal pain. If fever, nausea, or severe pelvic pain appear, the infection may have already progressed to pelvic inflammatory disease.

Symptoms of Chlamydia in Men

Men may experience a clear to cloudy urethral discharge, sometimes only noticeable first thing in the morning. Burning during urination is common, while testicular pain and swelling can signal epididymitis, which is an inflammation of the tube that stores and carries sperm. In many cases, these symptoms are often mild enough to be dismissed entirely.

What Does Chlamydia Discharge Look Like?

In women, chlamydia discharge is typically cloudy white, yellowish, or greenish. It’s often thicker than normal and may have an unusual odor. In men, the discharge tends to be clear to cloudy, sometimes yellow-green, and usually small in volume but persistent.

It can be easy to confuse chlamydia discharge with a yeast infection or bacterial vaginosis, but the key difference is that yeast infections typically produce thick, white, cottage cheese-like discharge with itching, while bacterial vaginosis has a distinct fishy smell. In such cases, a lab test is the only way to confirm the cause.

Rectal, Throat, and Eye Chlamydia

Chlamydia infections can manifest in several areas. These include:

• Rectal chlamydia: develops from receptive anal sex and can cause pain, itching, bleeding, or mucus-like discharge. 
• Throat chlamydia: this can follow oral sex, though it often produces no symptoms at all and is commonly missed during routine screening. 
• Eye chlamydia: this causes redness, pain, and sticky discharge, usually from touching infected fluids and then the eyes.

How Long Can You Have Chlamydia Before It Causes Damage?

Being a silent infection, chlamydia can remain undetected for months or even years, during which it can cause serious harm. For women, if left untreated, an infection may result in pelvic inflammatory disease, scarred fallopian tubes, infertility, ectopic pregnancy, and persistent pelvic discomfort. For men, this can result in epididymitis and possible fertility problems.

During pregnancy, untreated chlamydia carries additional risks to both mother and newborn, including premature delivery, eye infection, and pneumonia in the infant. For this reason, time matters for keeping chlamydia under control, and testing is the only way to catch it early.

Are You Guaranteed to Get Chlamydia If Your Partner Has It?

Not necessarily. A single sexual exposure doesn’t guarantee transmission, but chlamydia is highly contagious. Risk depends on the type of sexual contact and whether a condom was used.

As for whether you can get chlamydia from oral sex? Yes. The risk is lower than with vaginal or anal sex, but oral transmission does occur. But if you’re wondering whether you can get chlamydia from kissing, then no, as chlamydia does not spread through saliva or casual contact.

That said, reinfection is common when both partners aren’t treated at the same time. If one person clears the infection while the other doesn’t, they can pass it right back. If you tested positive and your partner negative, it likely means you had a long asymptomatic phase or were tested before the infection was detectable.

Chlamydia Testing and Treatment Options

Testing is recommended after unprotected sex, with new partners, or if any symptoms of chlamydia appear. The most accurate method is a nucleic acid amplification test, which detects chlamydia DNA from a urine sample or a swab of the cervix, urethra, rectum, or throat.

Treatment for chlamydia is a short course of antibiotics, and the CDC recommends doxycycline 100 mg twice daily for seven days as the preferred first-line therapy. Most people become non-infectious within seven days of completing treatment. 

It is crucial to avoid sexual activity until the treatment is complete following a positive diagnosis. You should also make sure that all recent sexual partners undergo testing and treatment, and get retested three months later to check for any recurrence.

Get Chlamydia Testing at H.U.M. Clinic Today

Chlamydia is common, usually silent, and highly contagious, but it is fully treatable when caught early. While it might seem distressing, recognizing the symptoms of chlamydia, understanding what chlamydia discharge looks like, and knowing when to test all go a long way in preventing chlamydia from becoming a serious long-term complication.

At H.U.M. Clinic in Bangkok, we offer confidential STD testing in an ISO 15189:2022 and QCMD 2024-accredited laboratory, with same-day results, English-speaking doctors, and a discreet clinical setting near BTS Asok and MRT Sukhumvit. We offer precise testing, maintaining the confidentiality you’d expect from a reputable medical institution.

Book a confidential STD PCR test at H.U.M. Clinic today.

• STD PCR Test Information: https://www.hum-clinic.com/service/std-test-bangkok/
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References:

Chlamydia Fact Sheet. Retrieved June 12, 2026, from https://www.who.int/news-room/fact-sheets/detail/chlamydia 

Chlamydia (Nursing) – StatPearls. Retrieved June 12, 2026, from https://www.ncbi.nlm.nih.gov/books/NBK568744/ 

Chlamydia – StatPearls. Retrieved June 12, 2026, from https://www.ncbi.nlm.nih.gov/books/NBK537286/ 

Chlamydial Infections – STI Treatment Guidelines. Retrieved June 12, 2026, from https://www.cdc.gov/std/treatment-guidelines/chlamydia.htm 

Factsheet About Chlamydia. Retrieved June 12, 2026, from https://www.ecdc.europa.eu/en/chlamydia/facts 

Chlamydia. Retrieved June 12, 2026, from https://my.clevelandclinic.org/health/diseases/4023-chlamydia 

Sexually Transmitted Infections Surveillance, 2024 (Provisional). Retrieved June 12, 2026, from https://www.cdc.gov/sti-statistics/annual/index.html 

2025 European Guideline on the Management of Chlamydia Trachomatis Infections. Retrieved June 12, 2026, from https://iusti.org/wp-content/uploads/2025/03/white-et-al-2025-2025-european-guideline-on-the-management-of-chlamydia-trachomatis-infections.pdf

Frequently Asked Questions About Chlamydia

Q: What does chlamydia look like?

A: Chlamydia itself isn’t visible on the skin. The most noticeable sign is abnormal discharge, which can appear cloudy white, yellow, or greenish. Many people with chlamydia show no visible signs at all, making testing essential.

Q: Can you get chlamydia from oral sex?

A: Yes. Chlamydia can infect the throat through oral sex. The risk is lower than with vaginal or anal contact, but it does happen. Throat chlamydia often produces no symptoms and is easily missed without specific testing.

Q: Can you get chlamydia from kissing?

A: No. Chlamydia is not transmitted through saliva, kissing, or casual physical contact. It spreads through vaginal, anal, or oral sexual contact with an infected person.

Q: How long can you have chlamydia before it causes damage?

A: Chlamydia can remain undetected for months or years. Without treatment, it can cause pelvic inflammatory disease, fallopian tube scarring, and infertility in women, and epididymitis in men. Early testing and treatment are the best course of action to prevent these complications.