Where It Lives
Lips, oral mucosa, tongue, throat, nerve tissue (latent between outbreaks)
What It Does in the Mouth
HSV-1 causes oral herpes infections, commonly known as cold sores. After initial infection, the virus remains dormant in nerve tissue and can reactivate during times of stress, illness, or immune suppression, leading to painful blisters or ulcers.
Why It Matters for Whole-Body Health
Oral HSV-1 infections can signal immune system stress. Severe or frequent outbreaks may be more common in individuals with weakened immunity. The virus can also pose risks to newborns if transmitted during close contact when lesions are active.
Associated Oral Conditions
Cold sores
Oral ulcers
Painful mouth blisters
Immune suppression
Neonatal infection risk (if transmitted to newborns)
How It Spreads
- Direct contact with saliva
- Kissing
- Sharing utensils or drinks
- Contact with active lesions
- Can be transmitted even without visible sores
Risk Factors That Increase It
- Stress
- Illness or fever
- Immune suppression
- Sun exposure
- Fatigue
Life Stage Relevance