HACE

High Altitude Cerebral Edema (HACE)
HACE is the result of the swelling of brain tissue from fluid leakage. Symptoms of HACE include:

Headache
Weakness
Disorientation
Loss of co-ordination
Decreasing levels of consciousness
Loss of memory
Hallucinations & Psychotic behavior
Coma

This condition is rapidly fatal unless the afflicted person experiences immediate descent. Anyone suffering from HACE must be evacuated to a medical facility for follow-up treatment.