About HAPE.

It is characterized by increasing breathlessness even at rest, productive cough and bluish discoloration of lips and tongue. The sputum may become blood tinged later on. It usually strikes the second night onwards. The bluish discoloration is a late sign and should not happen in the hands of good friends. One important thing about HAPE is that it can occur in a setting outside of AMS. people can have full blown HAPE without headache and other symptoms of AMS. Thus when confronted with the above signs and symptoms of HAPE, toes should not be ignored or dismissed in the light of absence of headache. HAPE likewise seems to be a completely different pathology. It is invariably fatal unless interfered with.