Altitude injuries typically begin around how many feet?

Altitude injuries such as acute mountain sickness (AMS) often begin to occur at elevations around 8,000 feet, but symptoms can also appear at even lower altitudes, depending on the individual’s level of acclimatization and physical condition. The risk increases progressively with altitude, particularly noticeable in the 8,000 to 10,000 feet range. It's essential to recognize that while mild symptoms may start showing around 8,000 feet, significant altitude-related health issues are much more common at heights of 10,000 feet and above, where decreased oxygen pressure can lead to more severe symptoms.

Thus, while altitude-related problems can theoretically begin below ultimate elevations, 10,000 feet is often cited as the altitude where the majority of individuals begin experiencing more pronounced difficulties, which makes this the most accurate answer in the context of typical altitude injury onset among the options provided.