Blood group O appears over-represented in Caucasian patients admitted with epistaxis, compared with the control population, raising the possibility that blood group O is a risk factor for epistaxis. https://pubmed.ncbi.nlm.nih.gov/17537274/ Blood group O is known to be associated with a lower expression of von Willebrand factor which plays an important role in clotting. Blood group O is more common blood group in both groups of patients. It is significantly higher in patients with epistaxis compare with non epistaxis patients. It suggests that blood group O may be a risk factor in the development of epistaxis. https://www.arquivosdeorl.org.br/additional/acervo_eng.asp?id=565 Our study indicates that in the Turkish population, the 0 blood type is over-represented in patients with idiopathic epistaxis versus the general population. We … Continue reading Nose bleeds most common in blood type O