Altitude sickness will make your heart beat faster, you will have difficulty breathing and your whole body will collapse. That smell is unpleasant.

I felt this feeling when I was on a business trip in Tibet. I didn't feel anything strange when I got off the plane, but I took dozens of steps when I went up the stairs, feeling out of breath, and then I took a rest before returning to the dormitory.

I want to take a bath and have a rest as soon as possible because of running all the way. As a result, my heart beat faster and I had no strength at all. If my colleague hadn't helped me back to my room, I would have fainted in the bathroom.