More than 20 STDs have now been identified, and affect more than 13 million men and women in this country each year. People who have AIDS are very susceptible to many life-threatening diseases and to certain forms of cancer. Transmission of the virus occurs during sexual activity or by the sharing of needles used to inject intravenous drugs. Some HPVs are sexually transmitted and cause wart-like growths on the genitals. HPV is a major risk factor for cervical cancer.
Many people have few or no symptoms of infection.
Chlamydial Infections Chlamydial infections, the most common of all STDs, can affect both men and women. Infections may cause an abnormal genital discharge and burning with urination. However, many people with chlamydial infection have few or no symptoms of infection. Gonorrhea Gonorrhea causes a discharge from the vagina or penis and painful or difficult urination. Symptoms may include painful blisters or open sores in the genital area, which may be preceded by a tingling or burning sensation in the legs, buttocks, or genital region.