The main features of NUG are painful, bleeding gums and ulceration and necrosis of the interdental papilla. There may also be intra-oral halitosis, cervical lymphadenitis (swollen lymph nodes in the neck) and malaise. Treatment of the acute disease is by debridement and antibiotics, usually metronidazole. Poor oral hygiene and other predisposing factors may need to be corrected to prevent recurrence. ANUG is also known as trench mouth, as it was observed to occur in the mouths of front line soldiers during World War I.

Necrotizing ulcerative periodontitis
Necrotizing ulcerative periodontitis (NUP, or simply necrotizing periodontitis, NP) or acute necrotizing ulcerative periodontitis (ANUP) is where the infection leads to attachment loss (destruction of the ligaments anchoring teeth in their sockets), but involves only the gingiva, periodontal ligament and alveolar ligament. Usually this spectrum of diseases result in loss of attachment, and therefore many ANUG diagnoses may be technically termed NUP, although ANUG is the term in most common use. NUP may be an extension of NUG into the periodontal ligaments, although this is not completely proven. In the meantime, NUG and NUP are classified together under the term necrotizing periodontal diseases. Necrotizing stomatitis
Progression of NUP into tissue beyond the mucogingival junction characterizes necrotizing stomatitis, which has many features in similar with cancrum oris. Cancrum oris
Cancrum oris (also termed noma) is a necrotizing and destructive infection of the mouth and face, and therefore not strictly speaking a periodontal disease. In modern times, this condition usually occurs in malnourished children in developing countries. It may be disfiguring and is frequently fatal.
It has been suggested that all cases of cancrum oris develop from pre-existing NUG, but this is not confirmed. Furthermore, the vast majority of cases of NUG and NUP will not progress to the more severe forms, even without treatment. References
J Lindhe, NP Lang, T Karring (editors) (2008) "Clinical periodontology and implant dentistry" 5th edition, Blackwell Munksgaard, pp. 413,459 
MG Newman, HH. Takei, PR Klokkevold, FA Carranza (editors) (2012) "Carranzas clinical periodontology" 11th edition, Elsevier/Saunders, p. 165