By Swasthaay Team Table of Contents What Are Mouth Ulcers? Types of Mouth Ulcers Symptoms Causes Common Risk Factors in India Treatment & Home Care Healing Diet When to Seek Medical Help Prevention FAQs Sources 1. What Are Mouth Ulcers? Mouth ulcers—also known as canker sores or aphthous ulcers —are small, painful sores that develop on the soft tissues of the mouth, such as the inner cheeks, tongue, gums, and lips. They are not contagious and typically resolve within 7–14 days. The World Health Organization (WHO) notes that oral mucosal lesions, including ulcers, are among the most common oral health issues globally. (Source: WHO Oral Health Factsheet) 2. Types of Mouth Ulcers Minor Aphthous Ulcers Most common 2–5 mm Heal within 1–2 weeks Mild pain Major Aphthous Ulcers Larger than 1 cm Deeper and more painful Heal slowly May leave scars Herpetiform Ulcers Cluster of multiple tiny ulcers Severe ...