Will have clinical features of acute mountain sickness before<unk> , as<unk>  is a progression from AMS
Altered mental status, ataxia, gait disturbance, stupor (most sensitive findings)
Ataxia at high altitude is<unk><unk>  until proven otherwise
Progresses to coma if untreated
Uncertain mechanism, presumed cause is hypoxia leading to<unk><unk> 
Headache, nausea/vomiting (not always present)
Focal neuro deficits may be seen (3rd/6th CN palsies)
Seizures are rare
Ataxia at high altitude is<unk><unk>  until proven otherwise
Progresses to coma if untreated
High altitude cerebral edema
Acute mountain sickness
High altitude peripheral edema
Chronic mountain sickness
High altitude pulmonary edema
Decompression sickness
High altitude retinopathy
Sepsis 