<unk>  is characterised by polycythaemia (with subsequent increased haematocrit) and hypoxaemia; raised blood pressure in the lungs (pulmonary hypertension) can develop over time and in some cases progress to heart failure (cor pulmonale).<unk>  is believed to arise because of an excessive production of red blood cells (erythrocytes) due to the low oxygen levels at altitude, which increases the oxygen carrying capacity of the blood. The increased levels of erythrocytes causes increased blood viscosity and uneven blood flow through the lungs (V/Q mismatch). However,<unk>  is also considered an adaptation of pulmonary and heart disease to life under<unk>  hypoxia at altitude. Consensus for clinical diagnosis of<unk>  use laboratory values: haemoglobin in Males ≥ 21 g/dL; Females ≥ 19 g/dL, haematocrit > 65%, and arterial oxygen saturation (SaO2) < 85% in both genders.
Chronic mountain sickness
Decompression sickness
Ski sickness
Motion sickness
Simulator sickness
Altitude sickness
Morning sickness
Sweating sickness