Are there different degrees of Acute Mountain Sickness (AMS)?

Acute Mountain Sickness (AMS) has three forms: mild, moderate and severe.

The majority of people ascending to altitudes of 10,000 feet (3,048 m) or more will experience at least some symptoms of mild AMS. These symptoms include headache, weakness, nausea, and decreased appetite. Mild AMS usually begins within 12 to 24 hours of reaching a higher altitude and normally will disappear within three days. There are medications to treat the symptoms of AMS, but they cannot cure it. Resting and allowing your body to acclimatize,or descending to a lower elevation, are the only ways to cure AMS. Most people who are afflicted with AMS are able to move about on their own; only severe cases require someone to carry them, or otherwise transport them down.