What can be a symptom of both hypothermia and frostbite?

Confusion can indeed be a symptom experienced in both hypothermia and frostbite. In cases of hypothermia, the body's core temperature falls dangerously low, which can impair cognitive function and decision-making processes, leading to confusion as one of the primary signs. Similarly, frostbite can also lead to confusion, particularly if it occurs in conjunction with adverse environmental conditions that can affect overall body temperature and alertness. The body's response to extreme cold, which includes both frostbite and hypothermia, can induce shock, disorientation, and mental fatigue, causing confusion.

The other options, while they may present in various medical conditions, are not typically associated across both hypothermia and frostbite to the same extent. Shortness of breath is more commonly linked to respiratory issues or panic rather than these cold injuries. Nausea is not a primary symptom of either condition, although it may occur in some situations. Upper body pain is more likely related to injuries or strain rather than serving as a common symptom in these specific cold-related conditions. Hence, confusion stands out as the clear and relevant symptom shared by both hypothermia and frostbite.