label: chronic mountain sickness
label_lc: chronic mountain sickness
description: A pathological condition resulting from chronic exposure to hypoxia at high altitude. The syndrome is characterized by an excessive number of red blood cells associated with a high blood hemoglobin concentration ([Hb]), hypoxemia, and, in some cases, pulmonary hypertension. Clinical signs include headache, fatigue, sleep disturbances, dyspnea, digestive complaints, and high risk of thrombotic events.