HACE is the result of swelling or brain tissue from fluid leakage. Symptoms can include headache, loss of coordination, weakness, decreasing levels of consciousness including disorientation, loss of memory, hallucinations, psychotic behavior, and coma. Severe instances can lead to death if not treated quickly.
Immediate descent is a necessary life-saving measure (2,000 - 4,000 feet).
Diamox
What is High Altitude?
Acute Mountain Sickness
High Altitude Pulmonary Edema (HAPE)
High Altitude Cerebral Edema (HACE)
