Hello, You had sharp pain under the left breast, left arm and shoulder blade. You have had such a pain before also. Your left shoulder is also stiff. Not all causes of chest and shoulder pain are medical emergencies, but sometimes they may be indicative of severe cardiac problems. Neurological factors that can cause such problems are nerve compression, nerve sprain, costochondritis, GERD, etc. Cardiac causes are heart attack, MI (myocardial infarction), CAD (coronary artery disease), pericarditis, AS, etc. Get clinically examined by a cardiologist. Get required blood tests, echocardiography, EKG, lipid profile, stress tests, imaging tests, etc., done to detect any developing coronary artery disease. You will be treated accordingly. Stay away from addictions, smoking, drugs, alcohol, etc. In the meantime, lose weight if overweight and do stretch exercises under a Physical therapist. Take home made food rich in minerals and protein. Avoid packaged, processed, oily spicy junk food. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician