Thanks for your question on Health Care Magic. I can understand your situation and problem. You are having left sided chest pain on exertion. This is characteristic of cardiac diseases. So better to first get done ecg and 2d echo. If both are normal than no need to worry for heart diseases. Muscular spasm due to exercise can also cause similar symptoms. So avoid stress and tension. Avoid heavyweight lifting and strenuous exercise. Avoid movements causing pain. Start painkiller and muscle relaxant drugs. Apply warm water pad on affected areas. Don t worry, you will be alright. But first rule out cardiac cause. Hope I have solved your query. Wish you good health. Thanks.