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) | |