<unk> reptococcal pharyngitis <unk> rep<unk> 
Neisseria gonorrhoeae
Diphtheria (C. diptheriae)
Bacterial Tracheitis
Infectious mononucleosis (EBV)
Patients with peritonsillar abscess have a 20% incidence of mononucleosis 
Laryngitis
Acute Bronchitis
Rhinovirus
Coronavirus
Adenovirus
Herpesvirus
Influenza virus
Coxsackie virus
Herpangina
Hand-foot-and-mouth disease
HIV (Acute Retroviral Syndrome)
Patients with peritonsillar abscess have a 20% incidence of mononucleosis 
Herpangina
Hand-foot-and-mouth disease<unk> evens-Johnson Syndrome
Pemphigus
Angioedema
Deep neck space infection
Retropharyngeal abscess
Ludwig's angina
Parapharyngeal space infection
Peritonsillar Abscess (PTA)
Epiglottitis
Kawasaki disease
Penetrating injury
Caustic ingestion
Lemierre's syndrome
Peritonsillar cellulitis
Lymphoma
Internal carotid artery aneurysm
Oral Thrush
Parotitis
Post-tonsillectomy hemorrhage
Vincent's angina
Acute necrotizing ulcerative gingivitis
Retropharyngeal abscess
Ludwig's angina
Parapharyngeal space infection
GERD
Obstructive sleep apnea
Fungal infections (ex. candida)
Chronic sinusitis with post nasal drip
Inhalation of irritants (smoke, chlorine gas)
Breathing dry air
Glossopharyngeal neuralgia
Tumor:
Tongue
Larynx
Thyroid
Monomyelocytic leukemia
Thyroiditis
Retained Foreign Body
Tongue
Larynx
Thyroid
Sore throat
Streptococcal pharyngitis 
Headache
Neisseria gonorrhoeae
Headache 
Diphtheria 
Neck pain
Bacterial Tracheitis