What is the primary risk associated with ascending too quickly during a dive?

Ascending too quickly during a dive primarily increases the risk of decompression sickness, also known as "the bends." This condition occurs when a diver ascends too rapidly after being at depths where they have absorbed significant amounts of nitrogen due to increased pressure. As the diver ascends, the pressure decreases, leading to the nitrogen that was dissolved in the body's tissues and bloodstream coming out of solution too quickly. This forms bubbles that can cause various symptoms, affecting multiple bodily systems and potentially leading to serious complications.

Understanding decompression sickness is crucial for divers, as it highlights the importance of adhering to safe ascent rates and making safety stops during ascents. This practice allows for the gradual off-gassing of nitrogen, minimizing the risk of forming harmful bubbles in the body.