Are Mouth Ulcers and Cold Sores the Same Thing?

Are Mouth Ulcers and Cold Sores the Same Thing?

Mouth ulcers and cold sores are not the same thing, according to WebMD. Cold sores are caused by a virus, says Mayo Clinic, while regular mouth ulcers can have a variety of causes.

Mouth ulcers are sometimes a result of eating acidic foods such as citrus, notes WebMD. They are also caused by a person biting the inside of her cheek or a tooth or braces scraping against the inside of the mouth. Vitamin and mineral deficiencies also cause mouth ulcers.

Cold sores are tiny blisters that cluster around a person's mouth, says Mayo Clinic. They are contagious, filled with fluid and crust over after they break. They heal without a scar within two weeks to a month.