Oncologist Highlights 'Three-Week Rule' to Distinguish Mouth Ulcers from Serious Symptoms Wednesday, May 27, 2026 oncology cancer mouthulcers headandneck protontherapy symptoms diagnosis healthcare stomatology radiotherapy Mouth ulcers are a common annoyance, often linked to stress, tiredness, or minor irritations like ill-fitting braces or spicy foods. While most ulcers are harmless and clear up within one to two weeks, radiation oncologist Dr … Read More