What is "acute necrotizing ulcerative gingivitis"

n. (context medicine English) Medical name of the form of severe gum infection popularly called trench mouth.

Acute necrotizing ulcerative gingivitis (ANUG; colloquially known as trench mouth) is a common, non-contagious infection of the gums with sudden onset. The main features are painful, bleeding gums, and ulceration of inter-dental papillae (the sections of gum between adjacent teeth). This disease, along with necrotizing (ulcerative) periodontitis (NP or NUP) is classified as a necrotizing periodontal disease, one of the seven general types of periodontitis. The often severe gingival pain that characterizes ANUG distinguishes it from the more common chronic periodontitis which is rarely painful. ANUG is the acute presentation of necrotizing ulcerative gingivitis (NUG), which is the usual course the disease takes. If improperly treated or neglected, NUG may become chronic and/or recurrent. The causative organisms are mostly anaerobic bacteria, particularly Fusobacteria and Spirocaete species. Predisposing factors include poor oral hygiene, smoking, malnutrition, psychological stress and immunosuppression (sub-optimal functioning of the immune system). When the attachments of the teeth to the bone are involved, the term NUP is used. Treatment of ANUG is by debridement (although pain may prevent this) and antibiotics (usually metronidazole) in the acute phase, and improving oral hygiene to prevent recurrence. Although the condition has a rapid onset and is debilitating, it usually resolves quickly and does no serious harm. The synonym "trench mouth" arose during World War I as many soldiers developed the disease, probably because of the poor conditions and extreme psychological stress.