Acid reflux does not as such cause backache, but it is more of an indirect relationship. With build-up of acid in the stomach, you could feel a burning pain in the lower abdomen, the mid chest, or behind the breast bone. Then the sensation is felt in the chest and abdomen, radiate to other areas like the back. However the combination of acid reflux and back pain cannot be attributed to acid reflux alone and the doctor is the best person to decide if it is just an acid reflux and back pain connection.