| Iatrogenic | Salivary gland disease |
| • Drugs | • Sjögren's syndrome |
| Anticholinergics (such as antidepressants, antihistamines, antihypertensives, antiretrovirals) | • HIV infection |
| Sympathomimetics (such as bronchodilators) | • Hepatitis C virus |
| • Irradiation damage | • HTLV-I infection |
| • Graft versus host disease | • Sarcoidosis |
| • Aplasia | |
| Dehydration | |
| • Uncontrolled diabetes | |
| Psychogenic | |