Chest feels tight, when i breathe in deeply i can feel a rib pop, but my asthma is well controlled. peakflow monitor is good (greenzone).

Ribs: Slipping rib syndrome occurs when the ligaments holding the ribs in place move, cause the ribs to shift or "slip."Slipping rib syndrome usually affects the eighth, ninth, or tenth ribs, as these lower ribs are not connected to the mid-chest bone.The chest probally feels tight likely due to some mild asthma but I would follow up with your doctor.