What type of decompression sickness is very rare in aviation?

The correct answer pertains to Type 2 decompression sickness, commonly referred to as the “chokes.” This specific type is characterized by pulmonary symptoms that can arise due to the formation of gas bubbles in the lungs following a rapid reduction in atmospheric pressure, often seen in divers. In aviation, the typical ascent rates and the limited time exposed to low-pressure environments make the occurrence of pulmonary decompression sickness much less likely compared to recreational diving scenarios.

In aviation, pilots and passengers usually experience a gradual reduction in pressure, such as when an aircraft ascends or descends slowly. Consequently, the risk of gas bubbles rapidly forming in the lungs, leading to symptoms like respiratory distress or cough associated with Type 2 is significantly minimized. Other types of decompression sickness, such as Type 1 Bends, primarily cause joint pain due to nitrogen bubbles affecting tissues and can occur in aviation—though still rarely—due to similar atmospheric pressure changes.

Neurological symptoms associated with Type 3 decompression sickness can also occur, but these symptoms are uncommon in aviation contexts. Type 4 skin manifestations are not typically classified under the types relevant to decompression sickness and are generally not an issue in the aviation environment.

In summary, Type 2 Pulmonary decompression sickness is