| Idiopathic |
| Bell's palsy |
| Melkersson-Rosenthal syndrome (recurrent alternating facial palsy, furrowed tongue, faciolabial edema) |
| Congenital |
| Traumatic |
| Myotonic dystrophy |
| Moebius syndrome |
| Hereditary congenital facial paresis 1 |
| Hereditary congenital facial paresis 2 |
| Hereditary hypertrophic neuropathy |
| Hemifacial microsomia (Goldenhar syndrome) |
| Poland syndrome |
| Teratogenesis |
| Osteopetrosis |
| Sclerosing bone dysplasias |
| Trisomy 13, trisomy 18 |
| Branchio-oto-renal syndrome |
| Trauma |
| Basal skull fracture |
| Penetrating injury to middle ear |
| Lightning |
| Barotrauma |
| Neurologic |
| Opercular syndrome (cortical lesion in facial motor area) |
| Millard-Gubler syndrome |
| Amyloid neuropathy |
| Infection |
| External otitis |
| Otitis media |
| Mastoiditis |
| Chickenpox |
| Diphtheria |
| Herpes zoster cephalicus (Ramsey Hunt syndrome) |
| Encephalitis |
| Poliomyelitis (type 1) |
| Mumps |
| Mononucleosis |
| Leprosy |
| Influenza |
| Coxsackievirus |
| Malaria |
| Syphilis |
| Tetanus |
| Tuberculosis |
| Botulism |
| Acute hemorrhagic conjunctivitis (enterovirus 70) |
| Gnathostomiasis |
| Mucormycosis |
| Lyme disease |
| Cat scratch |
| HIV |
