SDI Open Water Scuba Diver Practice Exam

Which of the following is an indication of decompression sickness?

1. Instant relief after surfacing

2. Itching or rashes on the skin

3. Joint pain and dizziness

4. Enhanced visual clarity

The correct answer is: Joint pain and dizziness

Decompression sickness, commonly known as "the bends," occurs when a diver ascends too quickly after spending time at depth, allowing nitrogen absorbed in the tissues to form bubbles as pressure decreases. The symptoms associated with decompression sickness can vary, but joint pain and dizziness are among the most common indications. Joint pain, often described as severe discomfort in the joints, is particularly characteristic of decompression sickness, as the nitrogen bubbles can interfere with normal joint function and cause significant pain. Dizziness may also occur due to the body's response to the nitrogen bubbles disrupting normal blood flow or affecting the nervous system. The other symptoms listed do not specifically indicate decompression sickness. Instant relief after surfacing would be more associated with a successful ascent without incidents. Itching or rashes could stem from other causes, such as skin irritation or allergic reactions, and enhanced visual clarity does not relate to decompression sickness at all; rather, it may refer to normal changes in perception as a diver returns to surface pressures. Thus, joint pain and dizziness are key indicators of this condition.