Immune system?: it is quite frequent - most of these are viral - but if bacterial and you have been frequently on antibiotics - it is also harmful for immune system . Other condition which may lead to is is anatomy of septum , sinus area. More rare IgA deficiency may lead to frequent upper respiratory infections. For this see allergist/immunologist and ENT . Try Nasal Saline rinses daily - mechanical cleansing
Answered 1/10/2017
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