Chest pain on the left side with pain radiating to the left shoulder and arm can be a sign of a heart attack. This is a medical emergency, and you should seek immediate medical attention rather than waiting or self-treating.

Left arm pain with neck, upper back discomfort, and even minimal chest pain can sometimes signal heart problems, including a heart attack. However, it could also be due to muscle strain or nerve issues. You should seek immediate medical evaluation to rule out any serious cardiac condition.