At what altitude do ear problems occur more frequently due to greater pressure changes?

Ear problems are more frequently encountered closer to the earth's surface, particularly during rapid altitude changes associated with activities such as takeoff and landing in aviation. This phenomenon is due to the significant pressure differences between the air in the middle ear and the external environment. As one ascends or descends quickly, the Eustachian tubes may not effectively equalize the pressure, leading to discomfort, pain, or even barotrauma in the ears.

At higher altitudes, the relative pressure change experienced by the ears is typically less pronounced because the atmospheric pressure decreases gradually. Mid-altitudes may also present a risk, but the most acute issues tend to arise during transitions at lower altitudes where the pressure changes are more drastic due to the compression and expansion of air in the ear during these phases.