| Iatrogenic | | Medication side effects (chemotherapy, neuroleptics, etc) | | Postsurgical muscular or neurogenic | | Radiation | | Corrosive (pill injury, intentional) | | Infectious | | Mucositis (herpes, cytomegalovirus, Candida, etc) | | Diphtheria | | Botulism | | Lyme disease | | Syphilis | | Metabolic | | Amyloidosis | | Cushing's syndrome | | Thyrotoxicosis | | Wilson disease | | Myopathic | | Connective tissue disease (overlap syndrome) | | Dermatomyositis | | Myasthenia gravis | | Myotonic dystrophy | | Oculopharyngeal dystrophy | | Polymyositis | | Sarcoidosis | | Paraneoplastic syndromes | | | Neurological | | Brainstem tumors | | Head trauma | | Stroke | | Cerebral palsy | | Guillain-Barré syndrome | | Huntington disease | | Multiple sclerosis | | Polio | | Postpolio syndrome | | Tardive dyskinesia | | Metabolic encephalopathies | | Amyotrophic lateral sclerosis | | Parkinson disease | | Dementia | | Structural | | Cricopharyngeal bar | | Zenker's diverticulum | | Cervical webs | | Oropharyngeal tumors | | Osteophytes and skeletal abnormalities | | Congenital (cleft palate, diverticula, pouches, etc) | |
