Canker sores commonly develop after an injury to the inside of the mouth, like biting the inside of a cheek. They are not a result of a virus or bacteria.

Canker sores erupt from small oval reddened sores to a white-edged sore. The lips, cheek, tongue, and the base of the gums are most affected. Canker sores are not contagious or associated with any disease. Most canker sores will usually disappear within seven to ten days; however, some may need antibiotics if they become infected.

Cold sores are caused by the herpes simplex virus 1, but can also be caused by the herpes simplex virus 2 via oral sex. Cold sores start with a warm tingling sensation and develop into a group of small blisters that rupture. These mouth sores generally occur outside the mouth but can be on the inside of the mouth on the upper palate or gum line. They can be very painful but usually go away within two weeks.

Stress, hormones, sun exposure and other infections can trigger outbreaks of cold sores. To prevent the spread, people with cold sores should not share personal items such a makeup, eating utensils, drinking containers, and towels, and should avoid kissing.

For more information about managing the symptoms of canker sores or cold sores contact Capital Health Link where nurses are available 24-7 to provide health advice and information. Call 408-LINK (5465) or toll free 1-866-408-LINK.

More information

Cold sores

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Reviewed by Alberta clinical experts. Brought to you by HealthLink Alberta. Copyright.
This material is designed for information purposes only. It should not be used in place of medical advice, instruction and/or treatment. For more health information call Capital Health Link at 408-LINK (5465) 24 hours a day, seven days a week.