What Causes Growing Pains?

Growing Pains are real, but no one seems to know why exactly kids get them. Learn what we do know here on SciShow Quick Question!

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Sources:
http://www.mayoclinic.org/diseases-conditions/growing-pains/basics/definition/con-20029782
http://www.slate.com/articles/double_x/the_kids/2013/08/growing_pains_in_kids_are_they_real_what_causes_them_and_is_there_any_treatment.html
http://www.ncbi.nlm.nih.gov/pubmed/15289780
https://my.clevelandclinic.org/childrens-hospital/health-info/ages-stages/preschool/hic-Growing-Pains
http://www.ncbi.nlm.nih.gov/pubmed/19039913
https://www.healthychildren.org/English/health-issues/conditions/orthopedic/pages/Growing-Pains-Are-Normal-Most-Of-The-Time.aspx
http://news.psu.edu/story/141240/2007/11/05/research/probing-question-are-childrens-growing-pains-real
http://www.ncbi.nlm.nih.gov/pubmed/20171654
http://www.mayoclinic.org/diseases-conditions/osgood-schlatter-disease/basics/definition/con-20021911
https://www.nlm.nih.gov/medlineplus/ency/article/001258.htm