<prompt> Mc causes of epistaxis in 3years old child:Nasal polypForeign bodyUpper respiratory catarrhAtrophic rhinitis  <response>: MC cause of epistaxis in children is idiopathic 2nd most common of epistaxix in children is: infectiontrauma-development of crusts-nasal pickingdigital trauma-nasal bleed. Ref.Scott Brown 7e,vol 1,p 1064. 