I've been smoking for the last 5 years, and lately, Im noticing this weird pain in the center of my chest. It doesn't bother me when I'm just sitting or standing still, but if I stretch my arms or put any pressure on my chest, I get this sharp pinching feeling inside. Even just warming up before a workout or sleeping in one position can trigger it. There's no fatigue, coughing up blood, or anxiety. Do you think it's something serious, or should I just not worry about it too much?

Ecg and chest x-ray pa view is advised to the patient.