Which type of decompression sickness involves musculoskeletal symptoms?

Decompression sickness (DCS), often referred to as "the bends," can be categorized into different types based on the symptoms and systems affected. Type 1 decompression sickness, also known as "mild DCS," primarily manifests with musculoskeletal symptoms. These symptoms typically include joint and muscle pain, often resembling arthritis or other musculoskeletal disorders, and are frequently described as a deep, aching pain.

This occurs when nitrogen gas that has dissolved in the body's tissues during a period of high pressure (such as when diving) begins to form bubbles as pressure decreases rapidly during ascent. The formation of these bubbles can cause irritation and inflammation in joints and muscles, leading to significant discomfort and pain.

In comparison, Type 2 decompression sickness involves more severe systemic symptoms and primarily affects the neurological, cardiovascular, and pulmonary systems. This can include symptoms such as confusion, dizziness, weakness, and in severe cases, can lead to respiratory distress or neurologic impairments.

Type 3 and Type 4 decompression sickness are less commonly referenced and may not align with the typical presentations of DCS categorized under the first two types. Thus, Type 1 is recognized specifically for its association with musculoskeletal symptoms and is the most accurate answer in this context.