What may a diver experience during ascent that indicates a reverse squeeze?

During ascent, a diver may experience pressure pain, which indicates a reverse squeeze. A reverse squeeze occurs when the pressure inside a body cavity, such as the ears or sinuses, does not equalize during ascent. As a diver ascends, the outside pressure decreases, while the pressure within these cavities remains higher, leading to discomfort or pain.

This situation often arises in the middle ear or sinuses, where air doesn't escape fast enough to balance the decreasing ambient pressure. Proper equalization techniques, such as the Valsalva maneuver, are essential to avoid this condition. Recognizing pressure pain as a sign of reverse squeeze is crucial for a diver to take appropriate action to alleviate the discomfort and prevent injury. Other symptoms like disorientation, shortness of breath, or hypothermia might indicate different dive-related issues or complications but are not specifically associated with a reverse squeeze.