is generally due to allergy
& common cold
. If you don't feel you have cold, just clean your nose with lukewarm water. Notice while cleaning if you have any thick irritating hair that needs trimming (particularly if you are a male).
Have some hot soup, or chicken soup if you eat non-veg. You can also take menthol in hot steam for mild symptoms of rhinitis
(running nose infection).
Hope you feel better soon!