Canker Sores: Causes and Relief

What they are

Canker sores are small, round sores in the mouth — on the inside of the cheek, under the tongue, or at the back of the throat.

• They usually have a red edge and a gray center.
• They can be quite painful.

Not cold sores

Cold sores are caused by herpes simplex. Canker sores are different, and aren't contagious.

What can trigger them

• a viral infection;
• stress;
• food allergies;
• a lack of vitamins and minerals;
• hormonal changes or menstrual periods.

Sometimes the cause is unknown.

Relief

• Most canker sores go away on their own.
• Some ointments, creams or rinses may ease the pain.
• Avoid hot, spicy food while you have one.

Sources

Based on the MedlinePlus health topic "Canker Sores," National Library of Medicine; a work of the United States government in the public domain.