The combination of alcohol plus cabin pressure at cruising altitude may threaten sleeping plane passengers' heart health, ...

you can probably return to that altitude without problems as long as you are properly acclimatized. The concentration of oxygen at sea level is about 21% and the barometric pressure averages 760 mmHg.

Learn about altitude sickness (mountain sickness), its symptoms, types, and effective treatments to stay safe while trekking ...

Some people experience high-altitude headaches due to changes in barometric pressure, such as during plane travel. Others, who experience migraine headaches or tension-type headaches, find that ...