Treatment for nasal allergies will frequently help. This may include oral antihistamines like Claritin, Allegra, Zyrtec; nasal steroids such as Fluticasone, Nasal antihitamines such as Astelin or Patanase. If specific allergies  can be indentified, and this could be done with a simple blood test,  Allergy injections can be helpful (we would refer you to a colleague for this).