What is the primary symptom of ear squeeze in its initial phase?

The primary symptom of ear squeeze in its initial phase is a pressure sensation that will progress to severe pain if equalization is not successfully achieved. This condition occurs when the external pressure on the eardrum exceeds the internal pressure in the middle ear, leading to discomfort. Divers may experience a feeling of fullness or pressure in the ears as they descend. If they do not equalize the pressure properly through techniques like the Valsalva or Frenzel maneuver, this sensation can escalate into significant pain due to the stretching of the eardrum and surrounding tissues. Understanding this symptom is crucial for divers, as it underscores the importance of equalizing ear pressure to avoid more serious injuries such as barotrauma.