This phenomenon is one of the most common complaints among travelers. While usually temporary, an ear that refuses to "pop" can turn a great trip into a headache of pressure and muffled hearing.

Significant hearing loss that persists for more than 48 hours. Dizziness or vertigo (a spinning sensation). How to Prevent It Next Time

You can’t "pop" fluid. You have to drain it.

If you have a cold or allergies, your Eustachian tube is swollen shut. Yawning is useless. You need an anti-inflammatory.

If physical maneuvers don't work, the issue might be inflammation.

Ideally, the tube opens briefly to let air flow, creating a small popping or clicking sound. When it fails to open, you are left with a pressure imbalance.

Most of the time, ears pop within a few hours or a couple of days. However, you should seek medical attention if you experience: Severe, sharp pain that doesn't subside. Fluid or blood draining from the ear canal.