Causes of Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
| Neoplasms | Neurologic |
| Carcinomas | Guillain-Barré syndrome |
| Lung | Multiple sclerosis |
| Duodenum | Delirium tremens |
| Pancreas | Amyotrophic lateral sclerosis |
| Ovary | Hydrocephalus |
| Bladder, ureter | Psychosis |
| Other neoplasms | Peripheral neuropathy |
| Thymoma | Congenital malformations |
| Mesothelioma | Agenesis corpus callosum |
| Bronchial adenoma | Cleft lip/palate |
| Carcinoid | Other midline defects |
| Gangliocytoma | Metabolic |
| Ewing's sarcoma | Acute intermittent porphyria |
| Head trauma | Pulmonary |
| Infections | Asthma |
| Pneumonia, bacterial or viral | Pneumothorax |
| Abscess, lung or brain | Positive-pressure respiration |
| Cavitation (aspergillosis) | Drugs |
| Tuberculosis, lung or brain | Vasopressin or desmopressin |
| Meningitis, bacterial or viral | Chlorpropamide |
| Encephalitis | Oxytocin, high dose |
| AIDS | Vincristine |
| Vascular | Carbamazepine |
Cerebrovascular occlusions, hemorrhage | Nicotine |
Cavernous sinus thrombosis | Phenothiazines |
Genetic | Cyclophosphamide |
X-linked recessive | Tricyclic antidepressants |
(V2 receptor gene) | Monoamine oxidase inhibitors |
| Serotonin reuptake inhibitors |