Back pain is caused from a variety of problems including “Acute Pulmonary Edema.” Edema builds up abnormal and excessive fluids that cause serious actions to the tissue cells. What happens is similar to over watering plants. The plant will swell and gradually wither away. Edema in acute stages is defined as heart failure to one side, yet the problem extends to cause pain in the back. What occurs is when the heart is interrupted; it channels the fluids to tubes, vessels, ducts, and passageways that extend to the lungs.