TABLE 1.

Causes of Bell’s Palsy

Infectious	Autoimmune	Oncologic	Other
Lyme disease	Guillain-Barré syndrome	Parotid gland tumor	Thyroid dysfunction (both hyper- and hypo-)
HIV/AIDS infection	Graves’ disease	A skull base tumor	Myxedema coma
Aseptic meningitis	Multiple sclerosis	Leukemic meningitis	Ischemic stroke
Herpes simplex encephalitis	Carcinomatous meningitis	Melkersson-Rosenthal syndrome	Hemorrhagic stroke
Herpes zoster oticus			Sarcoidosis
Ramsey-Hunt syndrome			Middle ear surgery
Mastoiditis			Facial trauma
Ischemic syphilis
Otitis media
Osteomyelitis of the skull base
Sinusitis