The possible explaination is medication dampened the central nervous system's attention and response to her back pain.
Central nervous system is divided into two parts namely brain and spinal cord. Nerves are responsible for transportation the message concerning pain to and fro the brain. Brain responds to the pain with pain killer and change the severity of pain.
Aquaporins are the water channels present in nervous system. Researchers have found association of aquaporins with pain transmission. This may suggest the possible function of water in medicine to effect the response to pain.
Aquaporins are membrane transport proteins that help in movement of water through the cell membrane based on osmotic gradient.
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