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Etiology of olfactory disorders.
| Local |
| ▪ Polyposis |
| ▪ Seasonal rhinitis |
| ▪ Allergic rhinitis |
| ▪ Sinusitis |
| ▪ Trauma |
| ▪ Malignancy |
| Systemic |
| ▪ Infections: viral, bacterial, fungal |
| ▪ Endocrine: diabetes, Addison disease, Cushing syndrome, hypothyroidism |
| ▪ Trauma |
| ▪ Neurologic: epilepsy, migraine, multiple sclerosis, neurodegenerative diseases |
| ▪ Drugs |
| ▪ Renal disease |
| ▪ Kidney disease |
