Why do Asthmatics struggle to cope with high altitude.

Question: Why do Asthmatics struggle to cope with high altitude.
- Keywords:
  altitude,
  asthma,
  asthmatics,
  cardiovascular,
  lung
Asked by jblitz to Audra, Fiona, Gavin, Justin, Steve on 18 Mar 2012.
- Justin Lawley answered on 18 Mar 2012:
  
  I think the main problem is the cold dry air that asthmatics suffer with not the altitude per see. Infact, I suffer with asthma and I do just fine at altitudes up to 6000 as long as I keep my asthma under control with medication.

Question: Why do Asthmatics struggle to cope with high altitude.