Why Does Water Hurt My Nose?

There's nothing better than going for a swim on a hot summer day! Sometimes, though, when you jump in the water, you might get a whole bunch of it up your nose! It's no fun, but why exactly does it hurt so much?

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SOURCES:
https://www.statnews.com/2016/04/21/boddities-hurt-get-water-nose/
https://www.npr.org/sections/health-shots/2011/08/19/139781956/hold-your-nose-to-avoid-brain-eating-amoebas
https://www.webmd.com/allergies/features/neti-pot-nasal-irrigation-pros-and-cons#1
http://www.sciencefocus.com/qa/how-much-salt-human-body
https://www.ncbi.nlm.nih.gov/books/NBK21739/