SDI Open Water Scuba Diver Practice Exam 2026 - Free Scuba Diver Practice Questions and Study Guide

The signs of decompression sickness primarily include joint pain, fatigue, dizziness, and difficulty breathing. Decompression sickness, often referred to as "the bends," occurs when a diver ascends too quickly, causing nitrogen gas absorbed in the body's tissues to form bubbles. These bubbles can lead to various symptoms that reflect the affected areas.

Joint pain is one of the most common manifestations, often described as a deep, nagging ache in the joints. Fatigue and dizziness can result from the body's stress response to nitrogen bubble formation and can affect overall cognitive and physical functions. Difficulty breathing may arise when bubbles obstruct blood flow or affect the lungs, leading to inadequate oxygen exchange.

The other options present symptoms that can occur in various medical conditions but are not the hallmark signs of decompression sickness. For instance, nausea, headache, blurred vision, and other symptoms listed in the remaining choices may occur in different scenarios but lack the specificity associated with decompression sickness. Therefore, understanding the context and nature of the symptoms is crucial for recognizing and responding appropriately to this dangerous condition.