| • Local | • Deficiency states |
| Candidiasis | Vitamin B |
| Erythema migrans | Folate |
| Lichen planus | Iron |
| • Psychogenic | • Diabetes mellitus |
| Cancerophobia | • Dry mouth |
| Depression | • Drugs (such as captopril) |
| Anxiety | • Denture problems |
| Hypochondriasis | • Parafunctional habits |