Common Sexually Transmitted Infections to Know for Human Sexuality

Understanding common sexually transmitted infections (STIs) is essential for maintaining sexual health. These infections can often go unnoticed, leading to serious health issues. Awareness, prevention, and treatment options are key to managing STIs effectively and promoting overall well-being.

  1. Chlamydia

    • Caused by the bacterium Chlamydia trachomatis, it is one of the most common STIs.
    • Often asymptomatic, especially in women, leading to undiagnosed and untreated cases.
    • Can result in serious reproductive health issues, including pelvic inflammatory disease (PID) and infertility.
    • Easily treated with antibiotics, but reinfection is possible without proper prevention measures.
  2. Gonorrhea

    • Caused by the bacterium Neisseria gonorrhoeae, it can infect the genital tract, rectum, and throat.
    • Symptoms may include painful urination, discharge, and pelvic pain, but many are asymptomatic.
    • Untreated gonorrhea can lead to severe health complications, including PID and increased risk of HIV.
    • Treatment typically involves antibiotics, but antibiotic resistance is a growing concern.
  3. HIV/AIDS

    • Human Immunodeficiency Virus (HIV) attacks the immune system, leading to Acquired Immunodeficiency Syndrome (AIDS) if untreated.
    • Transmitted through blood, sexual contact, and from mother to child during childbirth or breastfeeding.
    • Early detection and antiretroviral therapy (ART) can manage the virus and prevent progression to AIDS.
    • Regular testing and safe sex practices are crucial for prevention and management.
  4. Human Papillomavirus (HPV)

    • A group of over 200 related viruses, some of which can cause genital warts and various cancers, including cervical cancer.
    • Most sexually active individuals will contract HPV at some point, but many will not develop symptoms or health issues.
    • Vaccines are available to protect against the most harmful strains of HPV.
    • Regular screenings (like Pap smears) are important for early detection of cervical changes.
  5. Herpes Simplex Virus (HSV)

    • There are two types: HSV-1 (commonly causes oral herpes) and HSV-2 (commonly causes genital herpes).
    • Symptoms include painful blisters or sores, but many individuals may be asymptomatic.
    • The virus remains in the body for life, with potential for recurrent outbreaks.
    • Antiviral medications can help manage symptoms and reduce transmission risk.
  6. Syphilis

    • Caused by the bacterium Treponema pallidum, it progresses through stages: primary, secondary, latent, and tertiary.
    • Early symptoms include sores and rashes, but it can remain asymptomatic for years.
    • Untreated syphilis can lead to severe health complications, including damage to the heart, brain, and other organs.
    • Easily treated with antibiotics, particularly in the early stages.
  7. Trichomoniasis

    • Caused by the parasite Trichomonas vaginalis, it is one of the most common curable STIs.
    • Symptoms may include itching, burning, and unusual discharge, but many are asymptomatic.
    • Can increase susceptibility to other STIs, including HIV.
    • Treated effectively with prescription antibiotics.
  8. Hepatitis B

    • A viral infection that attacks the liver and can lead to chronic disease and liver damage.
    • Transmitted through contact with infectious body fluids, including sexual contact and sharing needles.
    • Many individuals may not show symptoms initially, but chronic infection can lead to serious health issues.
    • A highly effective vaccine is available for prevention, and antiviral medications can manage chronic cases.


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© 2025 Fiveable Inc. All rights reserved.
AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.