During a pressure drop in which zone might altitude sickness occur?

Altitude sickness, also known as acute mountain sickness (AMS), is more likely to occur in the Physiological Deficient Zone, which typically exists between 10,000 and 50,000 feet above sea level where the atmospheric pressure and oxygen levels decrease significantly. In this zone, the partial pressure of oxygen is insufficient for the body to maintain homeostasis, leading to symptoms associated with altitude sickness, such as headache, nausea, dizziness, and fatigue.

This zone specifically refers to altitudes where human physiology can experience notable stress due to reduced oxygen levels, requiring acclimatization for safe operation. Proper acclimatization can help the body adapt to the changes in oxygen availability; however, a rapid ascent without adequate acclimatization can precipitate altitude sickness.

The other zones mentioned, such as the Physiological Zone, Space Equivalent Zone, and Thermal Zone, do not typically present the same risks for altitude sickness as the Physiological Deficient Zone. The Physiological Zone refers to altitudes at or below 10,000 feet where the environment is still generally suitable for human operation with minimal physiological stress. The Space Equivalent Zone relates to higher altitudes or the conditions found in space which require specific life support systems. The Thermal Zone concerns temperature regulation and is separate