Hi, thank you for providing the brief history of your husband. As you mentioned he had endoscopy and colonoscopy under GA and now facing shortness of breath. He had pneumonia in the January and you have a doubt if due to the procedure of endoscopy and colonoscopy he is having this respiratory issue? Well, as per me i will say NO for it. Colonoscopy and Endoscopy will not lead to breathlessness issue anytime as per my knowledge. The answer to your query is in your question only. Wondering right??? Yes, the answer is , it is due to the effects of pneumonia. He must have taken the treatment for pnuemonia via the medicines but the lung tissue has only removed the infection and it has not made the lungs stronger. Let me mention a few things here when one has pneumonia what he should do to keep the lung tissue and respiratory muscles stronger - For pneumonia , the medical treatment is symptomatic and help to get rid of it, but the tissue weakness can not be made strong by the medicines. One need to exercises for it. Why exercise? right? The answer to this question is simple, Respiratory system consumes maximum energy of the human body, and the upto date fitness of the respiratory system is of always a need. Ask you husband to perform some breathing exercises and take steam inhalation. Breathing exercises 1. deep breathing 2. coastal breathing 3. pursed lip breathing 4. diaphragmatic breathing 5. abdominal breathing. This exercises will help him have good lung capacity and lung tissue will become stronger. also by performing this exercises the muscles of the respiratory system will become stronger and help him avoid shortness of breath. Also to make a note here is to do static neck exercises for strengthening the accessory muscles of respiration. Along with this doing core stability exercise will help the abdominal muscles stronger and provide efficient support to diaphragm which is the primary muscle of respiration. Oxygen is the basic need of the human body, Performing this exercise will make your husband not only get ease of shortness of breath, but also will help him to make his respiratory system stronger. As you know, respiratory system helps in the purification of the blood. So this exercises will help in purifying the blood and also will help to improve the immune system and improve metabolism as well. For any more query you can ask me a direct question as well. With the grace of god i wish your husband a healthy life Regards Jay Indravadan Patel