Canker sores often seem to pop up out of nowhere and, once you have them, they’re often painfully hard to ignore — especially when you try to eat or even talk. So what, exactly, are canker sores? They ...

Cold sores are caused by the herpes simplex virus (HSV). Once it has infected the body, the virus lies dormant, but may reactivate and cause a cold sore at any time, especially when the immune system ...

First, you’re not alone. Up to 80% of American adults have the herpes simplex virus (HSV-1), which can cause cold sores (also known as fever blisters), according to Johns Hopkins. The viral infection ...

Cold sores are caused by the herpes simplex virus (HSV). Once it has infected the body, the virus lies dormant, but may reactivate and cause a cold sore at any time, especially when the immune system ...