Which of the following symptoms might indicate a diver is experiencing decompression sickness?

Tingling and numbness in the extremities are significant symptoms that indicate a diver may be experiencing decompression sickness (DCS), often referred to as "the bends." This condition arises when dissolved gases, primarily nitrogen, come out of solution in the body tissues and blood as a diver ascends too rapidly. The nitrogen bubbles can form in various parts of the body, including the nervous system, leading to neurological symptoms such as tingling, numbness, or pinpoint pain in the arms and legs.

Recognizing these symptoms is crucial for immediate assessment and intervention, as they can escalate to more severe complications if not treated promptly. While rapid breathing, extreme fatigue, and water entering the mask may be concerning issues for divers, they are not classic indicators of decompression sickness. Rapid breathing may suggest hyperventilation or anxiety, extreme fatigue could be linked to exertion or other non-specific causes, and water entering the mask indicates a mechanical issue while diving. Thus, tingling and numbness hold a specific correlation with the physiological changes associated with DCS.