Flying with severely clogged ears or a heavy cold is potentially dangerous and should be avoided if possible. The risk lies in Ear Barotrauma, which occurs when the Eustachian tube is blocked (usually by mucus or inflammation) and cannot equalize the pressure between the middle ear and the airplane cabin during takeoff and landing. This can lead to intense pain, dizziness, and in severe cases, a ruptured eardrum or permanent hearing loss. If your ears feel "full" or you can't hear well before you even board, the rapid pressure changes during descent can cause the eardrum to bulge or bleed. If you absolutely must fly, doctors recommend using a strong nasal decongestant spray 30 minutes before descent and using the "EarPlanes" pressure-filtering earplugs. However, the safest course of action is to delay your flight until the congestion has cleared to prevent a painful and potentially long-lasting medical complication that could ruin your trip.