| Type | Causes |
| Physiologic | Menopause |
| Hot drinks | |
| Emotional distress | |
| Anaphylaxis | |
| Drugs | Alcohol |
| Alcohol plus chlorpromazine or disulfuram | |
| Diltiazem | |
| Amyl nitrate | |
| Nicotinic acid (niacin) | |
| Levodopa | |
| Bromocriptine | |
| Diseases | Carcinoid syndrome |
| Systemic mastocytosis | |
| Basophilic chronic granulocytic leukemia | |
| VIPoma | |
| Pheochromocytoma | |
| Medullary carcinoma of the thyroid | |
| Renal cell carcinoma | |
| Diencephalic seizures | |
| Postural Orthostatic Tachycardia Syndrome (POTS) |
