What symptom dictates immediate action during a dive?

Decompression sickness, often referred to as "the bends," is a serious condition that can occur when a diver ascends too quickly after spending time at depth. It happens when nitrogen that has been absorbed into the body's tissues during a dive begins to form bubbles as a diver ascends to shallower depths where the pressure is lower. The symptoms can range from mild to severe and can include joint pain, dizziness, difficulty breathing, and neurological impairments.

Immediate action is critical when symptoms of decompression sickness manifest, as prompt treatment—typically involving recompression in a hyperbaric chamber—can significantly improve outcomes and reduce the risk of permanent damage. The potential severity of this condition establishes it as an emergency situation that requires immediate attention during a dive, making it imperative to recognize the signs and respond accordingly.

While symptoms such as nausea, lightheadedness, and cold chills are concerning and should be monitored, they do not typically signal an immediate life-threatening situation like decompression sickness does. Thus, understanding the gravity of decompression sickness is essential for maintaining safety during diving activities.