When i breathe in deep something pops under my left rib, like it's moving. i've had a lot of heart burn lately?

GERD: Gastroesophageal reflux doesn't usually cause pain with a deep breath or cause something to pop on breathing. However since you're having frequent heartburn, follow a bland,low fat diet and,if you can take them, prilosec or nexium (esomeprazole) type medications should help. Avoid alcohol,caffeine and nicotine. See your Physician if symptoms persist.