Hi, thanks for using HCM. Sharp chest pains while taking deep breaths can have many causes, most of which are not serious. However, physicians who will be qualified to discuss this issue with you include your internal medicine physician or primary care doctor. In most people, sharp chest pains with deep breaths, especially with hard exercise or while breathing cold air is a perfectly normal finding which simply represents the sensitivities of the lining of the tubes inside the lungs to the fast flow of air or the cold. Possible causes are Pericarditis, lung lining problem, GERD, pulmonary embolism, heart disease. As always, the diagnosis and management of your specific condition will require a physical examination by your personal physician. Scheduling an office visit with your primary care doctor is recommended. Regards