Swallow repeatedly
Yawn
Chew gum
Suck on hard candy
Try the Valsalva maneuver: pinch your nose, close your mouth, and gently blow
Try the Toynbee maneuver: pinch your nose and swallow
Use a warm compress over the ear
Stay hydrated
Use a saline nasal spray if congested
Take a decongestant if appropriate for you
Avoid forceful blowing
Descend or ascend slowly when flying or driving in mountains
Stay awake during takeoff and landing
See a doctor if pain, hearing loss, or blockage lasts more than a few days