 [ Symptoms ] what can cause black colored stools [ Disease ] that is the nasolacrimal duct that drains tears from your eyes into your nose when you peel onions your eyes will water and your nose will run when you cry your nose will run this duct goes two ways so it is possible to have air come through when you blow your nose this is innocent and there is really nothing you can do to correct this normal phenomena unless you want a surgeon to close this duct then of course the tears will run down our cheek not a good solution though it is rare it is possible for air to come out through there the reason why is because the tear ducts are actually connected to the top of your nasal cavity normally when you cry some of your tears actually flow down into your nose   one of the reasons why our noses run sometimes when we cry since it is all connected anyway you probably just have slightly larger passages between the two areas