Oral ulcers are small painful sores that develop inside the mouth.
They are usually round or oval in shape and can appear on the tongue, inside the cheeks, back of throat or inner lips.
Common causes of oral ulcers include injury to the mouth, stress, hormonal changes, vitamin deficiency and a reaction to certain foods or products.
In most cases, oral ulcers are benign and resolve on their own within a week or two.
In rare cases, oral ulcers may be a symptom of a more serious underlying condition, such as a viral or autoimmune disease, and may require medical treatment. It is recommended to see a dentist or doctor if the ulcers persist or become frequent.