What are the most common causes of anosmia?
• Rhinitis/nasal congestion
• Smoking
• Head injury
• Craniotomy
• Subarachnoid hemorrhage
• Meningiomas of the olfactory groove
• Zinc and vitamin A deficiency
• Hypothyroidism
• Congenital disorders (Kallmann’s syndrome)
• Dementing diseases (Alzheimer’s, Parkinson’s)
• Multiple sclerosis
