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.
许可协议： CC0 1.0（公有领域） · 改编自 medlineplus.gov
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