Back pain is one of the most common reasons people self-treat and seek medical care. It will affect approximately three in four adults during their lifetime. When we speak about “back pain” we mean pain that originates in the spine anywhere between the upper and lower back.
Finally, the root cause may be in your foot. Back pain is one of the many possible injuries associated with flat feet and over-pronation (i.e., your foot tends to roll inward too much when you run). Likewise, if your second toe is longer than the big toe (a condition known as Morton's Toe), this could cause a weight imbalance resulting in back pain.