What is the difference between HSV-1 and HSV-2?

HSV-1 traditionally causes oral cold sores and HSV-2 causes genital herpes, but either type can infect either location. HSV-1 is now a common cause of genital herpes through oral-to-genital transmission.

Do cold sores mean I have an STD?

Oral cold sores from HSV-1 are very common and usually acquired through non-sexual contact in childhood. While in the same virus family as genital herpes, oral cold sores alone are not considered an STD.

Can herpes spread when there are no sores?

Yes, herpes can be transmitted through asymptomatic viral shedding. This is one of the main ways herpes spreads, which is why consistent preventive measures are important.

InfectiousICD-10: B00HSV-1 affects about 3.7 billion people globally (67% under 50)

Herpes Simplex

Also known as: HSV, Cold Sores, Fever Blisters, Oral Herpes

Herpes simplex virus infections are caused by HSV-1 (primarily oral herpes) and HSV-2 (primarily genital herpes). HSV-1 is extremely common, with most people acquiring it during childhood. The virus remains dormant in nerve cells and can reactivate periodically, causing recurrent outbreaks that become less frequent over time.

At a Glance

Common symptoms: Tingling, itching, or burning before sores appear (prodrome), Painful fluid-filled blisters on or around the lips, mouth, or genitals, Sores that break open, weep, and crust over
Main treatments: Antiviral medications (acyclovir, valacyclovir, famciclovir), Topical antiviral creams for mild oral outbreaks, Daily suppressive therapy for frequent recurrences
Category: Infectious · HSV-1 affects about 3.7 billion people globally (67% under 50)
See a doctor if: You are unsure if sores are caused by herpes

Symptoms

Tingling, itching, or burning before sores appear (prodrome)

Painful fluid-filled blisters on or around the lips, mouth, or genitals

Sores that break open, weep, and crust over

Fever and malaise during the first outbreak

Swollen lymph nodes near the affected area

Pain during urination if sores are near the urethra

Causes

HSV-1 transmitted through oral contact
HSV-2 transmitted through sexual contact
Direct skin-to-skin contact with an infected person
Asymptomatic viral shedding between outbreaks

Risk Factors

Close contact with someone who has HSV
Multiple sexual partners (HSV-2)
Weakened immune system
Stress, illness, or fatigue triggering reactivation

Diagnosis

Viral culture or PCR test from an active sore
Type-specific blood tests for HSV-1 and HSV-2 antibodies
Clinical examination of characteristic lesions

Treatment

Antiviral medications (acyclovir, valacyclovir, famciclovir)
Topical antiviral creams for mild oral outbreaks
Daily suppressive therapy for frequent recurrences
Pain relief with over-the-counter analgesics
Keeping sores clean and dry

Prevention

Avoid kissing or sharing utensils during active cold sore outbreaks
Use condoms to reduce genital HSV transmission
Avoid touching sores and wash hands after contact
Daily antiviral therapy to reduce transmission

When to See a Doctor

You are unsure if sores are caused by herpes
Outbreaks are frequent (more than 6 per year) or severe
You have a weakened immune system and develop sores
Sores appear near the eyes, which can threaten vision

Frequently Asked Questions

Related Conditions

Genital Herpes

Infectious

HPV (Human Papillomavirus)

Infectious

Shingles

Infectious

Impetigo

Infectious

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