Dysphagia
Odynophagia
Trismus
Edema of upper midline neck and floor of mouth
Raised tongue
"Woody" or brawny texture to floor of mouth with visible swelling and erythema
Raised tongue
Stridor
Drooling
Tongue protrusion
Trismus
Dysphonia
Cyanosis
Acute laryngospasm
Carotid sheath infection
IJ thrombophlebitis (Lemierre's Disease)
Mediastinitis
Empyema
Pericardial effusion
Pleural effusion
Mandibular osteomyelitis
Subphrenic abscess
Aspiration pneumonia
Cavernous sinus thrombosis
Brain abscess
Ludwig's angina
Streptococcal pharyngitis 
CMV esophagitis
Neisseria gonorrhoeae
Peritonsillar cellulitis
Diphtheria 
Esophageal candidiasis
Bacterial Tracheitis