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Chlamydial cervicitis in a female patient characterized by mucopurulent cervical discharge, erythema, and inflammation.]] Chlamydia is an asymptomatic disease for about 50-70% of the female population. Of those who have an asymptomatic infection that is not detected by their doctor, approximately half will develop pelvic inflammatory disease (PID), a generic term for infection of the uterus, fallopian tubes, and/or ovaries. PID can cause scarring inside the reproductive organs, which can later cause serious complications, including chronic pelvic pain, difficulty becoming pregnant, ectopic (tubal) pregnancy, and other dangerous complications of pregnancy. Chlamydia causes 250,000 to 500,000 cases of PID every year in the U.S. Women infected with chlamydia are up to five times more likely to become infected with HIV, if exposed.

Chlamydia is known as the "Silent Epidemic" because in women, it may not cause any symptoms and will linger for months or years before being discovered. Symptoms that may occur include: unusual vaginal bleeding or discharge, pain in the abdomen, painful sexual intercourse (dyspareunia), fever, painful urination or the urge to urinate more frequently than usual.

Male patients may develop a white, cloudy or watery discharge (shown) from the tip of the penis.

In men, chlamydia shows symptoms in about 50% of cases. Symptoms that may occur include: a painful or burning sensation when urinating, an unusual discharge from the penis, swollen or tender testicles, or fever. Discharge, or the purulent exudate, is generally less viscous and lighter in color than for gonorrhea. If left untreated, it is possible for Chlamydia in men to spread to the testicles causing epididymitis, which in rare cases can cause sterility if not treated within 6 to 8 weeks. Chlamydia causes more than 250,000 cases of epididymitis in the USA each year.

Chlamydia may also cause reactive arthritis, especially in young men. About 15,000 men develop reactive arthritis due to chlamydia infection each year in the USA, and about 5,000 are permanently affected by it. The triad of reactive arthritis, conjunctivitis and urethritis (inflammation of the urethra) is known as Reiter's Syndrome. All three entities must be present for this label to be used. It can occur in both men and women, though is more common in men. As many as half of all infants born to mothers with chlamydia will be born with the disease. Chlamydia can affect infants by causing spontaneous abortion; premature birth; conjunctivitis, which may lead to blindness; and pneumonia. Conjunctivitis due to chlamydia typically occurs one week after birth (Compare with chemical causes (within hours) or gonorrhea (2-5 days)).

Subtypes of Myocarditis	Histological Findings	Clinical Presentation
Fulminant	Multiple foci of inflammation	Acute severe cardiovascular compromise with ventricular dysfunction
Acute	IDH1 p53 Gene on chromosome 10q Gene on chromosome 17p Gene on chromosome 19q
Chronic Active	EGFR
Chronic Persistent	TP53 PDGFRA IDH1