Mouth sores are painful lesions that can appear on the lips, tongue, gums, or other tissues inside the mouth. Many resolve on their own, but the cause and severity determine whether further evaluation is needed. Below are common causes, signs to watch for, practical self-care measures, and guidance on when to consult a healthcare professional.
Mouth sores have many causes. Frequent types include aphthous ulcers (canker sores), cold sores from herpes simplex virus, trauma from biting or dental appliances, and fungal infections such as oral candidiasis. Systemic conditions, nutritional deficiencies, hormonal changes, and stress can also increase the risk of developing sores.
Sores often begin with pain, burning, or stinging. Lesions may have a red border with a white or yellowish center and can be single or multiple. Cold sores commonly start as blisters that break open; aphthous ulcers tend to be shallow, round, and well defined. If fever, swollen neck lymph nodes, difficulty swallowing or breathing, or progressive symptoms occur, seek prompt medical evaluation.
Good oral hygiene and measures to reduce irritation help most mouth sores. Rinsing with warm salt water, avoiding very hot, spicy, or crunchy foods, choosing soft foods, and applying cold compresses can ease discomfort. If pain limits eating or if sores recur frequently, discuss further assessment with a clinician. Avoid sharing items that contact the mouth when a contagious cause is possible.
Start with primary care or dental services for initial assessment. Recurrent, persistent, or treatment-resistant sores or those accompanied by systemic signs may prompt referral to dermatology, infectious diseases, or ear–nose–throat specialists. For suspected underlying systemic disease, internal medicine evaluation can be helpful. In emergencies—severe breathing or swallowing difficulty, uncontrolled bleeding, or rapidly spreading swelling—seek urgent care or emergency services.
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