Chlamydia: Symptoms, Testing, Treatment, and How It Differs From NGU

Chlamydia is a sexually transmitted infection caused by Chlamydia trachomatis. It often causes no symptoms, but untreated infection can lead to pelvic inflammatory disease, chronic pain, or fertility problems. Prompt testing and treatment reduce complications and transmission.

Chlamydia Is Not a Synonym for NGU

Chlamydia names an infection caused by a specific bacterium. Nongonococcal urethritis (NGU) is a syndrome of urethral inflammation not caused by gonorrhea. Chlamydia is one cause of NGU, but other organisms and noninfectious conditions can cause it. Urethral narrowing, catheter use, or irritation may produce urethritis-like symptoms; they do not create a chlamydia infection.

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Where Can Symptoms Occur?

• Cervix: unusual discharge, bleeding after sex or between periods, and pelvic pain
• Urethra: burning urination or discharge
• Rectum: pain, bleeding, or discharge
• Throat: usually no symptoms
• Testis or epididymis: pain or swelling that needs medical assessment

Many people have no symptoms, so testing is the only way to confirm infection.

Testing

NAAT uses urine or a sample from an exposed site, such as the vagina, throat, or rectum. The provider selects sites according to sexual activity, symptoms, pregnancy, and local guidance. A positive result cannot prove infidelity: infection may remain asymptomatic, and the time it was acquired is often unknown.

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Treatment

Take the guideline-recommended antibiotic exactly as prescribed. The regimen depends on pregnancy, infection site, and individual factors, so do not self-treat. Avoid sex until treatment is complete, the advised interval has passed, symptoms have resolved, and relevant partners have been assessed. Retesting at about three months is useful because reinfection is common.

Prevention and Shared Care

Use condoms or dental dams, test as recommended, and talk with partners without blame. Seek prompt care for severe lower-abdominal pain, fever, pregnancy, testicular pain, or symptoms that persist after treatment.

Verified references

Links and relevance to the article’s main topic were reviewed on 13 August 2026. Each source supports only the scope stated in the original document and does not replace personalised medical, legal, or service advice.

1. CDC: About Chlamydia Accessed 13 August 2026
2. CDC: Urethritis and Cervicitis Accessed 13 August 2026
3. CDC: About Sexually Transmitted Infections Accessed 13 August 2026