<s>[INST] hi,when ever i do any physical activity like running, i don't neceseraly have shortness of breath, but it feels like i can't take as much air in my lungs as i could normally. Also i have this feeling in my chest which vary's from the middle to the left and sometimes for a brief moment to the right. sometimes i feel it just in my middle-back on the right side. it feels like i have heartproblems but i don't have a high pulse or feel actual pressure in my chest. more just a feeling.. also not painfull but just concerning becouse it is in that area... i don't know if this is anough information but i hope you can ask me some more question regarding what symptoms i should have to get a sence of it being heart problems.. or that it's something like acid reflux which i have red about. i'm an 18 yo man . my father, uncle and grandfather have had hart problems in the past 3 months. (grandfather already 40 years back but now again) [/INST] Hello,Since you are having a strong family history of heart diseases, we should definitely rule out heart diseases for your symptoms. So better to consult a cardiologist, and get done blood pressure monitoring, ECG, 2d echo and stress test (trade mill test).If all these are normal, then no need to worry about heart diseases. Also, get done pulmonary function test (PFT) for the diagnosis of exercise-induced asthma. If PFT is normal, then no need to worry about lung-related diseases. Sometimes undiagnosed stress and anxiety can also cause similar feelings. So avoid stress and tension, be relaxed and calm.Hope I have answered your query. Let me know if I can assist you further. Regards,Dr. Kaushal Bhavsar </s>