Acute necrotizing ulcerative gingivitis (ANUG) 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 gum disease caused by inflammation of the gums (periodontitis). The often severe gum pain that characterizes ANUG distinguishes it from the more common chronic periodontitis which is rarely painful. If ANUG is improperly treated or neglected, it may become chronic and/or recurrent. The causative organisms are mostly anaerobic bacteria, particularly Fusobacteriota and spirochete species. Predisposing factors include poor oral hygiene, smoking, poor nutrition, psychological stress, and a weakened immune system. When the attachments of the teeth to the bone are involved, the term NUP is used. Treatment of ANUG is by removal of dead gum tissue 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 informal name trench mouth arose during World War I as many soldiers developed the disease, probably because of the poor conditions and extreme psychological stress. Signs and symptoms
In the early stages some affected people may complain of a feeling of tightness around the teeth. Three signs/symptoms must be present to diagnose this condition:
Severe gum pain. Profuse gum bleeding that requires little or no provocation.
Many other historical names for this condition (and Vincents angina) have occurred, including: "acute membranous gingivitis", "fusospirillary gingivitis", " fusospirillosis", "fusospirochetal gingivitis",  "phagedenic gingivitis", "Vincent stomatitis",  "Vincent gingivitis", and "Vincent infection".In the late 1980s-early 1990s, it was originally thought that some necrotizing periodontal diseases seen in severely affected AIDS patients were strictly a sequela of HIV, and it was even called HIV-associated periodontitis. It is now understood that its association with HIV/AIDS was due to the immunocompromised status of such patients; it also occurs with higher prevalence in association with other diseases in which the immune system is compromised. See also
Canker sore
Mouth ulcer

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