I am female aged 53.  About three weeks ago suddenly I developed a pain on the left side of my chest just below the left breast.  It is pronounced when I take a deep breath or yawn. I get relief lying on my right side at night. The pain has eased but is still there.  Would welcome your thoughts.Thanks Elsie A.
Hello! Thank you for asking on Chat Doctor! I read your question carefully, and would like to explain that your symptoms seem not to be related to any cardiac disorder. The pain which is modulated by the position of the body or body movements (like in your situation) is not related to the heart. It seems to be e musculoskeletal pain or pain related to the lungs. I recommend you to consult with the GP for a careful physical examination and perform a routine blood test, kidney and liver function tests, blood electrolytes, a rest ECG and a chest X-ray. If all the above-mentioned tests result normal, the most probable diagnosis would be a musculoskeletal pain. I would advise you to start ibuprofen for some days. Hope to have been of help! Greetings!