Dry cough, decreased exercise performance, prolonged exercise recover time, dyspnea on exertion, localized rales
Resting SaO2 is very low for the expected<unk>  but patients often appear clinically better than their saturation (aids in diagnosis)
Easily desaturates with exertion
Dyspnea at rest, marked weakness, productive cough, cyanosis, generalized rales
Cough generates pink, frothy sputum
Tachycardia and tachypnea correlate with severity of illness
Altered mental status and coma (from severe hypoxemia)
High altitude pulmonary edema
Asthma
High altitude cerebral edema
Bronchitis
High altitude peripheral edema
CHF
Acute mountain sickness
COPD