What is a major sign that notifies rescuers of potential decompression sickness (DCS)?

Joint pain or symptoms resembling the bends is a major sign that indicates the potential for decompression sickness (DCS). DCS occurs when a diver ascends too quickly, leading to the formation of nitrogen bubbles in the bloodstream and tissues. These bubbles can cause pain and discomfort, commonly referred to as "the bends," which typically manifests as joint pain, especially in the arms, shoulders, and knees. The distinctive nature of this pain, along with the timing of its onset after a dive, makes it a crucial indicator for rescuers to recognize. Understanding this symptom is vital for the timely and appropriate treatment of a diver affected by DCS, allowing for prompt medical intervention to prevent further complications.