What is the term for barotrauma that occurs on ascent?

The term for barotrauma that occurs on ascent is best identified as reverse squeeze. This condition arises when the pressure inside a body cavity, such as the middle ear, is greater than the external pressure as a diver ascends. During ascent, the ambient pressure decreases, leading to a situation where the pressure inside the ear, if not equalized, will push against the eardrum, potentially causing damage or discomfort.

As divers ascend, they need to equalize the pressure in their air-filled spaces, such as the ears and sinuses, to avoid discomfort or injury. If equalization is not performed correctly or timely, the internal structures may suffer from the increased pressure difference, resulting in what is referred to as a reverse squeeze. Understanding this term is crucial for divers to effectively manage their ascents and prevent injury.