It only happens when laying on my back and taking a deep breath... But it's driving me crazy! IM a 32 yrold female 5'6 140 lbs. No other symptoms. No medical problems. I was in the hospital over a year ago . I was very sick with fever and horrible back pain turns out I had fluid around my lungs and heart all due to a viral infection. I had many xrays and two echo cardiogram my heart is perfect so I know it's not that. Is it possible that it is acid reflux without hat burn? His do I get rid of this??? At my wits end!