A new study finds years of competitive sports may raise a teenager's risk of developing lower back pain.
The study found teens involved in sports since elementary school had higher rates of low back pain than their less competitive peers.
The rates of more serious debilitating back pain were also elevated.
Scientists aren't sure what's increasing the risk, whether its the training techniques, or certain postures or motions in particular sports.
The study appears in the American Journal of Sports Medicine.