Which symptom is the main sign of mild hypothermia?

Shivering is recognized as the primary symptom of mild hypothermia. When an individual's body temperature begins to drop, the body responds by involuntarily contracting muscles to generate heat, which results in shivering. This is an important physiological reaction that helps to raise the internal temperature back to normal levels. As such, shivering serves as a clear indicator that the body is attempting to combat the onset of hypothermia.

While confusion, hypotension, and nausea might accompany more severe stages of hypothermia or be present in other medical conditions, they are not initial signs that indicate mild hypothermia. In mild cases, the body's primary response is to shiver in an effort to maintain warmth, making it the most prominent symptom to observe.