The phrase "altitude problem" refers to difficulties or challenges that arise when you are at high elevations, such as mountains or planes in the sky. It can include issues like lack of oxygen, extreme cold, or physical exhaustion. Full definition
Coca leaf tea will be offered at your arrival to your Hotel which is very recommended to drink it in order to evoid altitude problems, also is recommend to have extra glucose in your liquids (Coramina) or Diamox for mayor Hypoxia conditions. (sastravelperu.com)
She may have had an altitude problem, or she may have mixed the cracker batter too long, which makes for a «gummy» result. (gflinks.com)