Nose whistle

Sometimes when you breathe in through your nose, a tiny noise can happen that sounds like a whistle. This noise happens because the air flowing through your nose is being blocked by something, like when you hold your finger over the end of a hose and the water comes out in a different way. The blockage could be caused by a piece of dried mucus or some other small thing. It's not anything to be scared of, it's just like a little song your nose is singing! If it bothers you, you could try blowing your nose or using saline spray to help clear any blockages.