What is usually the first symptom of a sinus squeeze?

The first symptom of a sinus squeeze typically manifests as a sharp pain above the eyes. This discomfort occurs due to a pressure imbalance in the sinus cavities as a diver descends underwater. As the external pressure increases with depth, the air in the sinuses becomes compressed, and if proper equalization techniques are not employed, the pressure can cause sharp pain and discomfort.

Recognizing this early symptom is crucial because it serves as an indication that the diver needs to equalize the pressure in their sinuses to avoid further complications. Failure to address this issue may lead to more severe symptoms or even injury if a diver continues to descend while experiencing this pain. Understanding the significance of this symptom helps divers react appropriately to maintain their safety and wellbeing underwater.