<s>[INST] When traveling to low altitudes, less than 3,000 , i have experienced chest pressure that starts about 10 minutes at the resting elevation. The pressure is centralized across the breast area and feels like gas. I do get burps, but then I get a shallow breathing. Seems like it s hard to breathe normally. I have had like a dizziness that starts from my body and goes to my head and doesn t last long - a few seconds. Then the back of my neck becomes stiff and tight and somewhat sore. I took a tums and the pressure did subside a little, but went away completely, as did all other symptoms, after we went back to our normal elevation of about 800 . Any idea what could be the problem? [/INST] Thanks for asking your question completely understand your problems we go to high altitudes the atm pressure decreases and concentration of oxygen decreases and air becomes denser so in order to escape from these symptoms of high altitude slow ascending and slow descending is followed that will acclimatize your body in due course of breaks in between climbing to high altitudes.thanks/regardsfeel free to ask more questions may god bless you with good health </s>