Thanks for your query; It is very difficult to me for find out the exact reason of your chest pain why because there is many factors which affects the left side of chest. Pain developing from chest wall, heart, upper gastrointestine and lungs all could be show same symptoms. There is chance due to angina, I suggest you to visit your general physician to a thorough checkup of your body including cardiac test and BP. You can also rule out any problems in related with angina by an ECG or a lipid panel accompany with a cardiac test. Get well soon.