Left-sided chest pain and arm pain could be due to cardiac cause or musculoskeletal pain. If you have any risk factors like diabetes, BP, lipid deranged means, addictions or strong family history you should be subjected for a routine cardiac evaluation. ECG can help to rule out resting Cardiac abnormality while TMT can help us find exertional or stress related test. 2-D echo can rule out any structural causes of cardiac pain.

Can be muscle pain

Left hand pain alone in your age is usually not related to heart. It could be musculoskeletal pain.