What Is a Herpes Simplex Virus (HSV) Mouth Infection?
A herpes simplex virus (HSV) mouth infection is a common viral condition that causes cold sores or fever blisters around the mouth. These sores are usually caused by HSV-1, though HSV-2 can also affect the mouth area.
After the first infection, the virus stays in the body and may become active again later. Some people only have one outbreak, while others may experience occasional flare-ups throughout their lives.
The virus spreads through close contact with infected saliva or sores. Kissing, sharing drinks or utensils, and skin-to-skin contact can all pass the virus from one person to another.
Certain triggers may cause the virus to reactivate, including:
- Stress
- Illness or fever
- Sun exposure
- Hormonal changes
- Fatigue
- Injury or surgery
Symptoms
HSV mouth infections can range from mild irritation to painful sores. Symptoms often appear in stages and may feel worse during the first outbreak.
Common symptoms include:
- Tingling, itching, or burning around the lips or mouth
- Small fluid-filled blisters
- Painful sores that crust over as they heal
- Redness or swelling near the affected area
- Discomfort while eating or drinking
A first-time infection may also cause:
- Fever
- Swollen lymph nodes
- Headache
- Sore throat
- Fatigue
How Is It Diagnosed?
Healthcare providers can often diagnose an HSV mouth infection by examining the sores and reviewing your symptoms. In some cases, additional testing may be recommended to confirm the diagnosis.
Tests may include:
- A swab or viral culture from the sore
- Blood testing
- Other lab testing if symptoms are unclear
Getting an accurate diagnosis can help rule out other conditions that may look similar.
How Is It Treated?
There is no cure for HSV, but treatment can help reduce discomfort and shorten outbreaks. Many cold sores heal on their own within one to two weeks.
Treatment options may include:
- Antiviral medications taken by mouth
- Prescription antiviral creams
- Pain-relief medicines
- Keeping the area clean and dry
- Drinking fluids to prevent dehydration
For people with frequent outbreaks, providers may recommend preventive antiviral medicine to reduce recurrences.
Avoiding triggers and practicing good hygiene can also help lower the risk of spreading the virus to others.
