Chlamydia

Present about one to three weeks after sex. Burning sensation when urinating, more frequent urination, discharge from penis or vagina, swollen or tender testicles. Most people infected with chlamydia have no symptoms. If symptoms do appear, they may be mild.

In women, pelvic inflammatory disease (PID), causing problems with pregnancy. Can also cause infertility.

Chlamydia can be cured with antibiotics.