Infection can occur from: *Pharynx: acute and chronic infection of tonsil and adenoids *Teeth: dental infection occurs from lower last molar tooth *Ear: Bezold's abscess and petrositis *Other space: infection of parotid retropharyngeal space *External trauma: penetrating injuries of neck, injection of local anaesthetic
Parapharyngeal abscess
Retropharyngeal abscess
Laryngeal cyst
Epiglottitis
Adenoiditis
Nasal septal abscess
Nasopharyngeal cyst
Peritonsillar abscess