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Why do you feel so awful at high altitudes?

June 30, 2019, 5:08 p.m. -- Latest version
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At high altitudes, the air density changes - the air is diluted.When you go from a lower altitude to a higher altitude until your body compensates by making more cells to deliver oxygen, your heart will beat faster and blood pressure will go up. As a result of more blood being pumped through the arteries to the brain, headaches are common. Lack of blood flow to the digestive organs can cause nausea, vomiting and loss of appetite.These are stressful changes, especially for people with weak hearts.

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