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Stomatitis is inflammation of the mouth and lips. It refers to any inflammatory process affecting the mucous membranes of the mouth and lips, with or without oral ulceration. In its widest meaning, stomatitis can have a multitude of different causes and appearances. Common causes include infections, nutritional deficiencies, allergic reactions, radiotherapy, and many others. When inflammation of the gums and the mouth generally presents itself, sometimes the term gingivostomatitis is used, though this is also sometimes used as a synonym for herpetic gingivostomatitis. The term is derived from the Greek stoma (στόμα), meaning "mouth", and the suffix itis ( ῖτις), meaning "inflammation".

Malnutrition (improper dietary intake) or malabsorption (poor absorption of nutrients into the body) can lead to nutritional deficiency states, several of which can lead to stomatitis. For example, deficiencies of iron, vitamin B2 (riboflavin),

Aphthous stomatitis (canker sores) is the recurrent appearance of mouth ulcers in otherwise healthy individuals. The cause is not completely understood, but it is thought that the condition represents a T cell mediated immune response which is triggered by a variety of factors. The individual ulcers (aphthae) recur periodically and heal completely, although in the more severe forms, new ulcers may appear in other parts of the mouth before the old ones have finished healing. Aphthous stomatitis is one of the most common diseases of the oral mucosa, and is thought to affect about 20% of the general population to some degree. The symptoms range from a minor nuisance to being disabling in their impact on eating, swallowing, and talking, and the severe forms can cause people to lose weight. There is no cure for aphthous stomatitis, and therapies are aimed at alleviating the pain, reducing the inflammation and promoting healing of the ulcers, but there is little evidence of efficacy for any treatment that has been used.

Inflammation of the corners (angles) of the lips is termed angular stomatitis or angular cheilitis. In children a frequent cause is repeated lip licking, and in adults it may be a sign of underlying iron deficiency anemia, or vitamin B deficiencies (e. g., B2 riboflavin, B9 folate, or B12 cobalamin, which in turn may be evidence of poor diets or malnutrition such as celiac disease). Also, angular cheilitis can be caused by a patient's jaws at rest being 'overclosed' due to edentulousness or tooth wear, causing the jaws to come to rest closer together than if the complete/unaffected dentition were present. This causes skin folds around the angle of the mouth which are kept moist by saliva, which in turn favours infection; mostly by Candida albicans or similar species. Treatment usually involves the administration of topical nystatin or similar antifungal agents. Another treatment can be to correct the jaw relationship with dental treatment (e. g., dentures or occlusal adjustment).

This is a common condition present in denture wearers. It appears as reddened but painless mucosa beneath the denture. 90% of cases are associated with Candida species, and it is the most common form of oral candidiasis. Treatment is by antifungal medication and improved dental hygiene, such as not wearing the denture during sleep.

Allergic contact stomatitis (also termed "allergic gingivostomatitis" or "allergic contact gingivostomatitis") is a type IV (delayed) hypersensitivity reaction that occurs in susceptible atopic individuals when allergens penetrate the skin or mucosa. Allergens, which may be different for different individuals, combine with epithelial derived proteins, forming haptens which bind with Langerhans cells in the mucosa, which in turn present the antigen on their surface to T lymphocytes, sensitizing them to that antigen and causing them to produce many specific clones. The second time that specific antigen is encountered, an inflammatory reaction is triggered at the site of exposure. These allergens may originate from many sources, including various foods and drink, chewing gum, toothpaste, mouthwash, dental floss, dental fillings, dentures, orthodontic bands or wires, and many other sources. Apart from not being restricted to the tongue, migratory stomatitis is an identical condition in every regard to geographic tongue. Another synonym for geographic tongue which uses the term stomatitis is "stomatitis areata migrans".

This is inflammation of the mouth caused by herpes simplex virus.

Stomatitis may also be caused by chemotherapy, or radiation therapy of the oropharyngeal area. The term mucositis is sometimes used synonymously with stomatitis, however the former usually refers to mucosal reactions to radiotherapy or chemotherapy, and may occur anywhere in the gastrointestinal tract and not just in the mouth.

The term necrotizing ulcerative gingivostomatitis is sometimes used as a synonym of the necrotizing periodontal disease more commonly termed necrotizing ulcerative gingivitis, or a more severe form (also termed necrotizing stomatitis). The term necrotizing gingivostomatitis is also sometimes used.

Also called smoker's palatal keratosis, this condition may occur in smokers, especially pipe smokers. The palate appears dry and cracked, and white from keratosis. The minor salivary glands appear as small, red and swollen bumps. It is not a premalignant condition, and the appearance reverses if the smoking is stopped. The condition resembles oral lichen planus when biopsied. The diagnosis is made by microscopic examination of biopsy tissue: direct immunofluorescence can reveal the presence of antinuclear antibodies specifically directed against the ΔNp63α form of the p63 protein, which is normally expressed within the basal layer of stratified epithelium.

Terms such as plasma cell gingivostomatitis, atypical gingivostomatitis and idiopathic gingivostomatitis are sometimes a synonym for plasma cell gingivitis, or specifically to refer to a severe form of plasma cell gingivitis.