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Vitamin D deficiency may be one of the causes of its development. To assess the relation between recurrent attacks BPPV and Vitamin D deficiency. A case control study in which 40 patients were clinically diagnosed as posterior canal BPPV, Serum 25(OH) D was measured at 1st visit. Patients were divided into two groups; group A (20 patients) received Vitamin D supplementation in addition to canal repositioning maneuver and group B (20 patients) treated by canal repositioning maneuver only. Follow up of all patients for 6 months, neuro-otological assessment was repeated and recurrent attacks were recorded. Serum vitamin D was repeated after 6\u00a0month. This study included 14 males and 26 females age ranged from 35 to 61\u00a0years, Average serum of 25 (OH) D at the first visit was (12.4\u2009\u00b1\u20092\u00a0ng\/ml) for group A, and (12.2\u2009\u00b1\u20091.7\u00a0ng\/ml) for group B, all patients had low serum level of 25(OH) D (below 20\u00a0ng\/ml). Recurrent BPPV episodes, were significantly lower in group A than that of group B. 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