Association Between Benign Paroxysmal Positional Vertigo and Vitamin D Deficiency .

Inclusion Criteria: * • Cases: Adults with a confirmed diagnosis of idiopathic BPPV based on positive Dix-Hallpike maneuver (nystagmus and vertigo lasting \<1 minute). * Controls: Adults attending ENT clinic without history of vertigo or BPPV, confirmed by negative Dix-Hallpike test. Exclusion Criteria: * Known causes of secondary vertigo (e.g., Meniere's disease, vestibular neuritis, central vertigo). * Conditions affecting vitamin D metabolism (e.g., chronic kidney disease, malabsorption syndromes, hyperparathyroidism). * Use of medications interfering with vitamin D levels (e.g., anticonvulsants, glucocorticoids) in the past 3 months. * Pregnancy or lactation. * Inability to provide consent.