Swallow repeatedly
Yawn
Chew gum
Sip water
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 upright for a while after landing
Use saline nasal spray if your nose is congested
Avoid forceful blowing
Seek medical care if pain, hearing loss, or pressure lasts more than a day