Drink plenty of water
Use a saline nasal rinse
Try a humidifier
Avoid smoke, dust, and strong odors
Use an over-the-counter antihistamine if allergies are the cause
Use an over-the-counter decongestant if appropriate
Try an over-the-counter nasal steroid spray
Elevate your head while sleeping
Gargle with warm salt water
Treat acid reflux if it is contributing
See a doctor if symptoms last more than 10 days
See a doctor if you have fever, facial pain, or trouble breathing