What physical sign may indicate that someone is experiencing Acute Mountain Sickness?

Exhaustion is a key physical sign that may indicate someone is experiencing Acute Mountain Sickness (AMS). AMS typically affects individuals when they ascend to high altitudes too quickly, where the body struggles to adapt to lower oxygen levels. Exhaustion in this context is often related to physical fatigue that can result from the body's attempts to cope with decreased oxygen availability.

As the body's oxygen saturation decreases, a person may feel more fatigued than usual, even if they haven’t exerted themselves excessively. This exhaustion can also be compounded by other symptoms such as nausea, insomnia, and headache, which are commonly associated with AMS.

The other options, such as increased body temperature, swelling of the limbs, and excessive sweating, are not primary indicators of AMS and are more likely to point to other medical issues or conditions. Understanding the correct signs of AMS is crucial for early detection and management, particularly in wilderness or remote settings where immediate medical assistance may not be available. Recognizing exhaustion as a symptom helps individuals take proactive measures, such as descending to a lower altitude or seeking medical attention if symptoms worsen.