I'm experiencing some pain in my chest on the right side of my body, especially when I take a deep breath. It's hard to pinpoint the exact spot, but it feels like it's near the upper part of my back. The pain gets intense with certain movements and when I breathe deeply. This happened about a year ago too, and the doctor did an ECG, but everything checked out fine back then. I don't have any other symptoms, and everything else seems normal. Could it be from bad posture while sleeping or sitting, or maybe it's a severe acidity problem? What do you think is causing this?

Patient is advised pulmonary function test(PFT).