Sexually transmitted diseases (STDs) are diseases acquired from having sexual contact (vaginal, oral, or anal) with someone who has an STD. Sexually transmitted diseases are among the most common infectious diseases in the United States. Currently there are more than 25 STDs that affect both men and women.
http://www.webmd.com/sexual-conditions/12-std-questions-and-answers
Vaginitis
Vaginitis is inflammation of the vagina which is characterized by a vaginal discharge, itching, and/or irritation; a vaginal odor may be present.
http://women.webmd.com/guide/sexual-health-vaginal-infections
Chlamydia
Chlamydia is a sexually transmitted disease that infects the urethra in men, and the urethra and cervix in women. This disease can spread to the reproductive organs and may lead to infertility.
http://www.webmd.com/sexual-conditions/tc/chlamydia-topic-overview
Condyloma / Genital Warts / Human Papilloma Virus
Condyloma acuminata are genital warts caused by the human papilloma virus (HPV). HPV is one of the most common sexually transmitted diseases. The virus affects the skin on the outside of the body and the mucous membranes, it may cause cervical cancer if not treated.
http://www.webmd.com/sexual-conditions/hpv-genital-warts/human-papillomavirus-hpv-test
http://www.webmd.com/sexual-conditions/hpv-genital-warts/tc/genital-warts-human-papillomavirus-topic-overview
Genital Herpes
Genital herpes is a sexually transmitted disease caused by the herpes simplex virus (HSV). The disease causes outbreaks of itchy and painful sores in the genital area. It may also affect the mouth and lips.
http://www.webmd.com/genital-herpes/tc/genital-herpes-topic-overview
Gonorrhea
Gonorrhea is a sexually transmitted disease. It is a bacterial infection of the urethra in men, and the urethra and cervix in women. This disease can spread to the reproductive organs and may lead to infertility.
http://www.webmd.com/sexual-conditions/tc/gonorrhea-topic-overview
Hepatitis
Hepatitis is an inflammation of the liver caused by certain viruses. Viral hepatitis may include hepatitis A, hepatitis B, and hepatitis C. Hepatitis may be caused by other factors, such as use of drug and may be sexually transmitted. Treatments for hepatitis vary, depending on the type.
http://www.webmd.com/hepatitis/default.htm
HIV
Human immunodeficiency virus, or HIV, is the virus that may lead to acquired immune deficiency syndrome (AIDS) after many years. The virus weakens the immune system making it difficult to fight infections and cancer by attacking and destroying white blood cells. HIV and AIDS is an incurable disease, however, there are medications that strengthen the immune system, helping those infected to live a better quality of life.
http://www.webmd.com/hiv-aids/guide/sexual-health-aids
Pelvic Inflammatory Disease
Pelvic inflammatory disease, commonly called PID, is a sexually transmitted disease (STD) that affects the female reproductive organs. Pelvic inflammatory disease is one of the most serious complications of a sexually transmitted disease in women. Pelvic inflammatory disease can cause irreversible damage to the uterus, ovaries, fallopian tubes, or other parts of the female reproductive system, and may cause infertility.
http://women.webmd.com/sexual-health-your-guide-to-pelvic-inflammatory-disease
Syphilis
Syphilis, a sexually transmitted disease caused by the bacteria Treponema pallidum and can be effectively treated with antibiotic therapy. Primary syphilis initially resembles chancre sores. The sores are like large round bug bites that are hard and painless and occur on the genitals or in or around the mouth.
http://www.webmd.com/sexual-conditions/syphilis
Trichomoniasis
Trichomoniasis is a sexually transmitted disease (STD) caused by an organism called Trichomonas vaginalis. Women are most often affected by this disease with symptoms of vaginal discharge or vulvar itching and irritation; a vaginal odor may be present. Men are often asymptomatic and usually do not know they are infected until their partners need treatment.