Since four out of five of people have back pain , often lower back pain , sometime in their life , we should know what causes it and how to avoid it . Causes Of Lower Back Pain As we get older , our bodies tend to lose their muscle elasticity and tone , as well as bone strength . The discs in our spine lose fluid and flexibility , and they ca n't cushion the vertebrae as well anymore .
What type of pain or injury is the narrator discussing .
A. They are discussing bicep problems .
B. None of the above choices .
C. They are discussing spinal problems .
D. They are discussing disc issues .


B