Gonorrhea, caused by bacteria, can lead to painful urination, discharge, and complications such as pelvic inflammatory disease if untreated.

Chlamydia is a common bacterial infection that is often asymptomatic but can cause pelvic pain and infertility if left untreated.

Herpes is a viral infection causing painful blisters or sores on the genitals or mouth, with periodic outbreaks.

Syphilis is a bacterial infection that progresses through stages, starting with painless sores and potentially leading to severe complications if untreated.

HIV/AIDS is a viral infection that weakens the immune system, leading to opportunistic infections and, if untreated, progressing to AIDS.

Hepatitis B is a viral infection affecting the liver, transmitted through sexual contact or blood exposure, often leading to chronic liver disease.

HPV is a common viral infection that causes genital warts and increases the risk of cervical and other cancers.

Trichomoniasis is a parasitic infection causing genital itching, discharge, and discomfort during urination.