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Growing pains are a form of recurring limb pain experienced by children. Despite the name, growing pains are not caused by growth. In fact, the cause of growing pains is still not known. Most often, the pain is felt in the legs, particularly in the thighs, calves and the backs of the knees.Growing pains occur in children 3-14 years of age.[1]In a few children, growing pains occur in later teen years as well. Estimates of the percentage of children who experience growing pains range from 2.6-49.4%[ 2], which serves to illustrate how loose the definition of this condition can be.
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Hashkes P.J. and Lowe R.M. (2008) Growing pains: a noninflammatory pain syndrome of early childhood. Nature Clinical Practice Rheumatology 4:542-549.
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Goodyear-Smith F. and Arroll B. (2006) Growing pains. British Medical Journal 333:456–457.
It is not known what causes growing pains. They are not caused by growth (as was originally suggested); other periods of rapid growth