At which altitude does the air begin to be noticeably thinner?
At 12,500 feet the air becomes thinner and oxygen becomes lower making it difficult to breathe.
Last updated on 19 May 2023
High hemoglobin levels can lead to dizziness, fatigue, easy bruising and other symptoms.
Avoid visiting places on the same day when you get to higher altitudes. Acclimatise and only then get to places which requires climbing.
You will likely feel nauseous and lightheaded. You may vomit and have a headache. Different levels of altitude sickness have different symptoms: Symptoms of mild, short-term altitude sickness usually begin 12 to 24 hours after arriving at high altitude
At altitude, the reduced oxygen content of the blood induces breathing instability, with periods of deep and rapid breathing alternating with central apnea. This breathing pattern is called high-altitude periodic breathing (PB).
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