Experiencing soreness in my chest area... For a month. Checked with a cardiologist. Heart's working perfectly. The pain went away few days back again resurfaced. Not a regular heavy smoker, but when I smoke cigarettes generally while drinking, I smoke a few (more than few actually). No cough, no sore throat, no troubled breathing, no breathing shortness, no problem if I walk. Only this soreness in chest, that too only when I bend myself and put pressure towards chest. Is this serious or just a bad sleeping posture that needs to be fixed?