<s>[INST] I ve been treated for bronchitis and finished my z-pack today. Every time I courgh and breath deep there is a really sharp pain under my collarbone on the left side. I thought it might be pulled muscles but it s only on one side and really high up where no muscles are. Any advise would be helpful. Thank you I do have a pace maker in that area sss or sinus node syndrome Cassie L. FTW TX [/INST] hi,thank-you for providing the brief history of you.A thorough clinical assessment is advised followed by which and x-ray is advised.As the pain is near the collar bone. this looks more of a muscular. Also z-pak is given in case of infection and if there is any a physician should be able to help change medication.Since you have bronchitis and a respiratory infection the pain is related to muscle fatigue. As due to bronchitis the accessory muscles of respiration has abundant job to perform to fullfill the basic requirements of the body.Also, in my Clinical practice we provide Pulmonary rehabilitation and retrain the muscles of respiration. This pain in the collar bone is the common issue with patients having bronchitis or any other particular Pulmonary condition. But all respond well to physical therapy and Pulmonary rehabilitation.Regards.Jay Indravadan Patel </s>