There are so many reasons for shortness of breath. You have mentioned several. Altitude may cause shortness of breath, but this happens more when people with emphysema or chronic obstructive pulmonary disease (COPD). Shortness of breath can be a symptom of asthma. If this is the case, then the inhaler should help.
A hiatal hernia can crowd the chest area giving the lungs less room to work. In addition to shortness of breath, this could also cause the ‘heaviness’ that your father feels in his chest. Often this is worse when bending over.
Shortness of breath can certainly happen with panic attacks and cause the panic attack to worsen. The stress that your father has been under could be adding to this situation. The Xanax® (alprazolam) that he is taking can help. Another option is for your father to work with a therapist to learn relaxation techniques. Then your father could gain control over these panic attacks and be able to break the cycle of panic and shortness of breath.
Pulmonary rehabilitation is a program to bring back your quality of life through aerobic exercise done on a regular basis. The walking and rowing that your father is doing are excellent. When done routinely, this conditions the entire body so that the muscles are working as efficiently as possible. This allows the breathing muscles to use the least amount of energy to move air in and out of the lungs. Over time this helps to lessen shortness of breath. Some programs will also include education about your lung condition and nutrition. Please read our Pulmonary Rehabilitation MedFact at http://www.nationaljewish.org/medfacts/pulmonary.html for more information. Share this information with your doctor to see if this would be helpful and where in your area there are programs.
Shortness of breath is NOT a normal process of aging! To know for sure if this is due to a lung problem your father may need to have further testing done. Generally testing for a breathing problem starts with a simple breathing test called spirometry. This test provides detailed information about how your lungs are working. If your father’s symptoms are due to a lung problem, this testing should identify the cause. A pulmonologist would be the type of specialist to identify a lung problem and the best treatment.
Another possible cause of shortness of breath is a heart problem. A cardiologist would be the type of specialist to identify a heart problem and the best treatment.
Starion