What symptom can indicate High Altitude Cerebral Edema (HACE)?

Ataxia is a critical symptom that can indicate High Altitude Cerebral Edema (HACE). HACE is a severe form of altitude sickness that results from the swelling of the brain due to decreased oxygen availability at high altitudes. Ataxia refers to a lack of coordination and unsteady movements, which are common neurological signs stemming from this swelling. In the context of HACE, ataxia often manifests as difficulty walking, impaired balance, and disorientation.

Other symptoms associated with HACE may include severe headaches, confusion, and even altered consciousness, but the defining feature that signals a significant compromise in neurological function is ataxia. This symptom indicates that the brain is significantly affected, and immediate descent to a lower altitude and medical attention are crucial to prevent further harm.