Chest and left arm pain can be a sign of a heart attack, which is a medical emergency requiring immediate attention. You should call emergency services right away or go to the nearest emergency room for urgent evaluation.

• While waiting for help, try to rest and avoid any physical exertion.
• If you have been prescribed nitroglycerin for heart conditions, take it as directed.
• Do not ignore these symptoms, especially if they are sudden, severe, or accompanied by shortness of breath, sweating, nausea, or dizziness.

Please seek immediate care from a cardiologist or emergency physician to ensure your safety. If you want, I can explain more about heart attack symptoms and risk factors.To narrow down potential causes, we will need some more information.I understand you're concerned about chest and arm pain. Please provide your age and gender so I can better understand your situation.