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There are different types of mouth sores. They can occur anywhere in the mouth including bottom of the mouth, inner cheeks, gums, lips, and tongue. Mouth sores may be caused by irritation from: A sharp or broken tooth or poorly fitting dentures.
There are a few common causes of gum inflammation that may fit your circumstances: 1  Medications: If you have recently started taking medication, your swollen gums may be a side effect of the drug. Talk to your doctor about your side effects to the medication, and find out if there are alternatives.