| Malignancy, especially gastric carcinoma |
| Chagas disease |
| Amyloidosis |
| Sarcoidosis |
| Neurofibromatosis |
| Eosinophilic esophagitis |
| Multiple endocrine neoplasia, type 2B |
| Juvenile Sjögren's syndrome with achalasia and gastric hypersecretion |
| Chronic idiopathic intestinal pseudo-obstruction |
| Anderson-Fabry disease |
