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Chlamydia is a common sexually transmitted disease (STD) caused by the bacterium, Chlamydia trachomatis, which can damage a woman's reproductive organs. Even though symptoms of chlamydia are usually mild or absent, serious complications that cause irreversible damage, including infertility, can occur "silently" before a woman ever recognizes a problem. Chlamydia also can cause discharge from the penis of an infected man.

For more information on chlamydia, including signs, symptoms, complications, diagnosis, treatment, and prevention, visit the Sexually Transmitted Diseases page
at the CDC.

2009 Chlamydia Prevalence Monitoring Project Annual Report (CDC)

Chlamydia – Fact Sheet  (CDC)
How do people get chlamydia? What are the signs and symptoms of chlamydia?
How does chlamydia affect a pregnant woman and her baby?

Chlamydia: The Facts – Brochure (CDC)
Basic information about chlamydia in plain language.

What to Watch for:

  • Symptoms show up 7-21 days after having sex. Most women and some men have no symptoms.


  • Discharge from the vagina.
  • Bleeding from the vagina between periods.
  • Burning or pain when you urinate (pee).
  • Pain in abdomen, sometimes with fever and nausea.


  • Watery, white or yellow drip from the penis.
  • Burning or pain when you urinate (pee).

How Do You Get this STD:

  • Spread during vaginal, anal or oral sex with someone who has chlamydia or NGU.

What Happens If You Don't Get Treated:

  • You can give chlamydia or NGU to your sexual partner(s).
    Can lead to more serious infection. Reproductive organs can be damaged.
  • Both men and women may no longer be able to have children.
  • A mother with chlamydia can give it to her baby during childbirth.