Differential diagnosis
Common
- Viral upper respiratory tract infections
- Febrile convulsions
- Acute bronchitis
- Acute sinusitis
- Cellulitis
- Viral gastroenteritis
- Urinary tract infection (lower) in adults
- Pneumonia
- Chickenpox
- Bronchiolitis
- Sepsis
- Acute tonsillitis
- Diverticulitis
Infrequent
- Pelvic inflammatory disease
- Acute pyelonephritis
- Acute otitis media
- Acute cholecystitis
- Infectious mononucleosis
- Ascending cholangitis
- Erythema infectiosum
- Mastitis
- Genital herpes
- Dental abscess
- Campylobacter infection
- Peritonsillar abscess (quinsy)
- Breast abscess
- Shingles
- Scarlet fever
- Pulmonary embolism
- Acute bacterial prostatitis
- Acute pericarditis
- Septic arthritis in adults
- Bartholin's cyst
- Cocaine
- Ischaemic colitis
- Osteomyelitis
- Non-typhoidal Salmonella
- Alcohol withdrawal
- Clostridium difficile diarrhoea
- Bacterial meningitis
- Mycoplasma pneumonia
- Lyme disease
- Tuberculosis
- Perianal abscess
- Subacute (De Quervain's) thyroiditis
- Infective endocarditis
- Preseptal cellulitis
- Rheumatoid arthritis
- Giardiasis
- Mastoiditis
- Herpes simplex encephalitis
- Viral m
Specific differential diagnosis
TYPES
High-grade pyrexiaLow-grade pyrexia