Hello! Thank you for asking on HCM! I understand your concern, and would like to explain that if the pain is modulated by the respiratory movements (as you refer), it is probably a musculo-skeletal pain. From the other handyour past medical history for COPD is concerning about other causes that may mimic this clinical scenario (a pulmonary embolism, pneumothorax, an aorta dissection, etc). I recommend consulting with your attending physician for a careful physical examination, a routine blood test and a chest x ray. A chest CT scan may be needed to exclude other causes than the musculo-skeletal pain. Hope to have been of help! Best regards, Dr. Iliri