Decompression sickness, often known as "the bends," occurs when a diver ascends too quickly after spending time at depths. As pressure decreases, dissolved gases, primarily nitrogen, form bubbles in the body, leading to various symptoms. These can include joint pain, dizziness, and difficulty breathing. Treatment typically involves administering pure oxygen in a hyperbaric chamber, which helps reduce bubble size and restore normal gas levels in the body. Early recognition and intervention are crucial to prevent serious complications, such as nerve damage or even death.