What Causes a Cold Sore?
When we ask ‘what causes cold sores in the mouth and on the lips?’, we really should be asking 'what triggers cold sores?'. The herpes simplex virus (HSV-1) is the initial cause of the infection – without it there are no cold sores or blisters – but the blisters themselves are often triggered by psychological and environmental factors, such as stress or a cold i.
Triggers of cold sore outbreaks vary from person to person. What causes cold sores to appear for one person may not be the same for another. It's important to figure out your likeliest cold sore triggers so you can avoid them, or at least manage symptoms more quickly and effectively when they occur.
Cold Sore Triggers
The main causes of cold sores on lips are ii:
- exposure to sun and wind
- hormonal changes
- weakened immune system