Acute Mountain Sickness (AMS) is common at what altitude?

Acute Mountain Sickness (AMS) is often associated with altitude changes and occurs when individuals ascend to elevations without proper acclimatization. The correct answer indicates that AMS commonly occurs at altitudes starting from 8,000 feet when coming from lower elevations, like below 3,500 feet.

At altitudes of 8,000 feet and above, the decrease in atmospheric pressure results in lower oxygen levels, which can negatively impact the body, particularly in those who are not acclimatized. Symptoms of AMS can include headache, nausea, dizziness, and insomnia. This understanding is crucial for anyone venturing into mountainous terrains, particularly for search and rescue missions, where rescuers may encounter victims suffering from AMS.

While the other choices reference various altitudes where AMS might be noted, they do not align with the most widely recognized threshold for its onset. Therefore, comprehending the onset at 8,000 feet provides a clearer guideline for individuals engaging in high-altitude activities, helping them to prepare adequately and recognize the importance of gradual ascent in order to prevent AMS.