Sexually transmitted diseases (STDs) are infections transmitted through sexual activity. They can vary in severity and symptoms, affecting both men and women. One common STD is Human Papillomavirus (HPV), which manifests as pink or flesh-colored bumps that can itch, cause discomfort, and bleed. Some strains of HPV can lead to cervical cancer, penile cancer, or cancer of the mouth and throat. Routine PAP smears can detect HPV, which is one of the most prevalent STDs in the U.S.   Herpes is a common STD that can be the result of two distinct viral strains. Both are sexually transmitted and cause genital herpes, with HSV-1, also causing cold sores or fever blisters. Hepatitis is another STD that can lead to liver inflammation and fibrosis. Transmitted through sexual contact and other means, it can have similar symptoms, including tiredness, nausea, vomiting, stomach pain, dark urine, and yellowing of the skin and eyes.   Syphilis is another common STD transmitted through direct contact with a syphilis sore. It typically begins with a round, firm, painless sore on the genitals, anus, or mouth. Gonorrhea and Chlamydia are also frequently encountered STDs, impacting both men and women. The Human Immunodeficiency Virus (HIV) is a well-known STD that weakens the immune system, leading to acquired immunodeficiency syndrome (AIDS) if left untreated.