Chlamydia is caused by a microscopic organism known as Chlamydia trachomatis.
Symptoms are usually mild to nonexistent.
They usually appear one to three weeks after exposure. Men sometimes have a whitish yellow discharge from the penis, redness at the tip of the penis, a frequent urge to urinate or a burning sensation while urinating. Women sometimes experience mild vaginal irritation, mild discomfort that they may mistake for menstrual cramps or vaginal discharge. The disease is spread by vaginal, oral or anal sex with an infected partner. A person infected with chlamydia may also develop conjunctivitis if he touches his eyes with a contaminated hand.