Here's a story from the Ohio State University Medical Center called "Arthritis in Teens Getting More Attention."
It seems that "growing pains" might be a sign of something more serious.
"It's become much more common to see teenagers with the condition -- some requiring hip replacements before the age of 20," the story said.
Arthritis often results from an injury to a joint or an infection. Children and teens who are injured playing sports might need joint surgery or replacements in the future, for example.
Also from the story:
"If your child complains about a pain that has been persistent, or he or she avoids certain physical activities they normally enjoy, it's a good indication that there is an underlying cause," added Dr. Tom Ellis, an orthopedic surgeon at The Ohio State University Medical Center who specializes in the care and treatment of arthritis and hip pain in people under the age of 50.
"Ellis, who specializes in arthroscopic hip surgery, says there are good treatments - surgical and non-surgical -- available. "Early diagnosis and treatment can make a big difference in how young people will function the remainder of their lives.""
The article also listed some symptoms to watch for:
-Stiffness when awaking and joint pain during the day
-Swelling around joints
-Reduced activity level
-Awkward or deliberately slow movements