Herpes Simplex (HSV)

Herpes simplex virus (HSV) is a common viral infection that causes recurrent skin sores around the mouth (often HSV-1, 'cold sores') or genitals (more often HSV-2). The virus stays in the body for life but is usually managed easily.

Table of Contents

Quick Facts

  • ICD-10: B00 (oral), A60 (genital)
  • Types: HSV-1, HSV-2
  • Cure: No
  • Recurrences: Usually milder than first outbreak

Overview

Most adults worldwide have HSV-1, often acquired in childhood. HSV-2 is less common and predominantly causes genital herpes. Either virus type can infect either site. After initial infection, the virus stays dormant in nerve cells and can reactivate periodically.

Symptoms

Primary infection

  • Painful cluster of small blisters at the affected site
  • Tingling or burning before sores appear
  • Swollen lymph nodes
  • Fever and body aches (especially in first oral or genital infection)

Recurrences

Often milder, with sores in the same area. Triggers can include sun exposure, illness, stress, hormonal changes, or fatigue. Many people with HSV have no symptoms but can still transmit the virus.

Transmission

  • Direct contact with sores
  • Contact with infected skin even without visible sores (asymptomatic shedding)
  • Oral sex (HSV-1 from mouth to genitals or vice versa)
  • Mother to baby during birth (rare but serious)

Diagnosis

  • Clinical appearance is often enough
  • PCR swab from active lesions is the most accurate test
  • Type-specific blood tests (HSV-1 and HSV-2 IgG) help in asymptomatic patients

Treatment

Antivirals

  • Acyclovir, valacyclovir, famciclovir — used for outbreaks or as daily suppressive therapy
  • Earlier treatment (within hours of prodrome or first lesion) is most effective

Symptom relief

  • Cool compresses
  • Pain relievers
  • Topical anesthetics

Prevention of transmission

  • Avoid contact during outbreaks
  • Daily suppressive antivirals can reduce transmission risk
  • Condom use reduces but doesn't eliminate genital HSV risk

When to See a Doctor

See a doctor for:

  • First suspected outbreak
  • Frequent recurrences considering suppressive therapy
  • Outbreaks during pregnancy, especially late pregnancy
  • Severe pain, fever, or atypical features
  • Outbreaks near or affecting the eye (urgent — to avoid corneal damage)

Related Conditions

Cold Sore

HSV-1 oral infection

 Genital Herpes

HSV affecting the genital area

 HIV / AIDS

Co-infections require attention

 Sore Throat

Sometimes accompanies oral HSV

Frequently Asked Questions

Can HSV be cured?

There is no cure. The virus stays dormant in nerve cells for life. Antivirals shorten outbreaks and can suppress them; vaccines are in research.

Can I have HSV without symptoms?

Yes — most people with HSV have no obvious symptoms but can still transmit the virus during periods of asymptomatic shedding.

Should I take daily medication?

Daily suppressive therapy is helpful for people with frequent outbreaks (typically six or more per year) or those wishing to reduce transmission risk to a partner.

Are cold sores really herpes?

Yes. Cold sores are caused by herpes simplex virus, usually type 1.

Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about a medical condition. If you are experiencing a medical emergency, call your local emergency number immediately.

References

  • Centers for Disease Control and Prevention. Genital Herpes — STD Information.
  • World Health Organization. Herpes simplex virus.