There are a number of reasons that joint problems present in adolescence. First, we must account for growth. Many young people do experience pain at night often in lower limbs when in a growth spurt. Second, trauma can make joints hurt. Given that most adolescents play a sport or three, joint fatigue, overtraining, weight lifiting (when not done properly), volleyball etc...can be painful. Third, it is a time in life when some diseases can cause swelling, pain and inflamation or soreness. Finally some medicines can do the same.
I would suggest you visit your doctor to properly diagnose what concerns you.
Great question and good luck.
Wayne Yankus, MD, FAAP
expert panelist: pediatrics