Many things: Including an old injury, posture problems, not enough exercise, or to much of the same exercise causing an over use injury. Even vitamin d deficiency has been linked to lower back pain.
Answered 1/14/2015
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Growing pains: Often due to rapid bone growth that causes stretching of ligaments attached to bones. If persists more than 6 weeks or if you have numbing or tingling in your legs would consult your physician.
Answered 3/31/2016
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A doctor has provided 1 answer
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