What Are All the Known STDs?

Chancroid, chlamydia, genital warts, gonorrhea and hepatitis B are examples of sexually transmitted diseases, according to Planned Parenthood. These diseases spread when a person passes an infection to someone else during a form of sexual contact. Herpes, HIV, AIDS, human papillomavirus, and molluscum contagiosum are other STDs. Many people with these infections do not have any symptoms or signs of disease. More examples of STDs include pelvic inflammatory disease, pubic lice, scabies, syphilis and trichomoniasis.

As of 2015, chlamydia is the most commonly reported STD in the United States, reports WebMD. While patients are usually infected through vaginal or anal sex, it is possible to contract it through oral sex as well. Common symptoms include a vaginal or penile discharge and a burning sensation while urinating, but only about 50 percent of men and 25 percent of women experience symptoms.

Human papillomavirus is the most common STD, according to the National Institute of Child Health and Human Development. Both men and women can be infected by over 40 types of human papillomavirus. This infection can result in genital warts, spread to several body parts, and cause cancers of the mouth, cervix, penis and vulva. Getting a pap smear test can help to detect or prevent this infection at an early stage.