What are the symptoms of canker sores?

What are the symptoms of canker sores?

You may have a canker sore if you have:

• A painful sore or sores inside your mouth — on the tongue, soft palate (the back portion of the roof of your mouth) or inside your cheeks.
• A tingling or burning sensation prior to the appearance of the sores.
• Sores in your mouth that are round, white, or gray in color, with a red edge or border.

In severe attacks, you may also experience:

• Fever.
• Physical sluggishness.
• Swollen lymph nodes.