Bell's palsy causes

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Template:GCC

Causes

Common Causes

• Herpes simplex virus
• Idiopathic
• Inflammation of the facial nerve
• Varicella zoster virus

Causes by Organ System

Cardiovascular	No underlying causes
Chemical/Poisoning	No underlying causes
Dental	No underlying causes
Dermatologic	No underlying causes
Drug Side Effect	No underlying causes
Ear Nose Throat	No underlying causes
Endocrine	No underlying causes
Environmental	No underlying causes
Gastroenterologic	No underlying causes
Genetic	No underlying causes
Hematologic	No underlying causes
Iatrogenic	No underlying causes
Infectious Disease	No underlying causes
Musculoskeletal/Orthopedic	No underlying causes
Neurologic	No underlying causes
Nutritional/Metabolic	No underlying causes
Obstetric/Gynecologic	No underlying causes
Oncologic	No underlying causes
Ophthalmologic	No underlying causes
Overdose/Toxicity	No underlying causes
Psychiatric	No underlying causes
Pulmonary	No underlying causes
Renal/Electrolyte	No underlying causes
Rheumatology/Immunology/Allergy	No underlying causes
Sexual	No underlying causes
Trauma	No underlying causes
Urologic	No underlying causes
Miscellaneous	No underlying causes

Causes in Alphabetical Order

Infectious Causes

• Herpes simplex virus reactivation is the most likely cause of Bell's Palsy.
• Herpes Zoster may be the second most common viral infection.
• Cytomegalovirus
• Epstein Barr virus
• Adenovirus
• Rubella virus
• Mumps
• Influenza B
• Coxsackievirus
• Rickettsial infection
• Ehrlichiosis
• Borrelia burgdorferi
• Acute HIV infection

Non-Infectious Causes

• Facial nerve inflammation
• Tumors and compression of the facial nerve
• Ischemic mononeuropathy
• Inactivated intranasal influenza vaccination was associated with several cases of Bell's palsy in Switzerland

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