When you hike in high altitudes your oxygen level drops to 80 percet is this a problem?

Yes, a drop in oxygen levels to 80% at high altitudes can pose a problem for many individuals. This reduced oxygen availability can lead to symptoms of altitude sickness, such as headaches, dizziness, and shortness of breath. It's important to acclimatize gradually and consider descending to lower elevations if symptoms become severe. Supplemental oxygen may also be necessary for some people in extreme conditions.