Possible causes of sialorrhoea
| Level of problem | Examples |
|---|---|
| Increased saliva production—hypersialia | Anticonvulsants—especially clobazam and clonazepam |
| Antipsychotic medication | |
| Nasal blockage—obligate nasal breathing | Adenoid/tonsillar hypertrophy |
| Oral cavity | Dental malocclusion |
| Poor lip closure | |
| Caries, gum disease, ulcers | |
| Salivary gland epithelial tumours (rare!) | |
| Isolated bulbar dysfunction | Worster Drought syndrome |
| Cranial nerve palsies | Bell's palsy |
| “Static” generalised motor disorder | Spastic quadriplegic or dystonic cerebral palsy |
| Acquired brain injuries | |
| Progressive motor disorder | Juvenile Parkinson's disease |
| Neurodevelopmental | Cognitive and awareness difficulties—“oral sensory dysfunction” |
| Severe learning disability | |
| Autism |