Mouth sores are like little cuts or ulcers in the mouth. The sores may be very red, or may have small white patches in the middle. They may bleed or become infected. They can be caused by radiation chemotherapy, infection, dehydration, poor mouth care, oxygen therapy, alcohol or tobacco use, not getting enough vitamins, or lack of protein.
Bleeding in the mouth is often caused by mouth sores, gum (periodontal) disease, or by a low platelet count (cells that help the blood clot). Low platelet counts can be a side effect of chemo or radiation treatment.
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