If your child complains of low back pain, pay attention. It's relatively common for adults to suffer from non-threatening low back pain. So, when a child complains about it, parents often tell their kids what works for them: rest, be careful, and it will go away on its own.
Adults constantly listen to their active children complaining about aches and bruises. Low back pain, however, often indicates something more serious. A Huffington Post article explains:
"The repetition and strain of sports such as gymnastics, football, volleyball and weight training (poor technique, too much volume, too much weight too often without recovery) can weaken the pedicle or pars interarticularis.... which serves as a bridge between the large, blocky part of the vertebra and the part of the vertebra containing the facet joints and bony prominences for tendon and muscle attachment."
Low back pain in children that isn't dealt with can potentially lead to lifelong problems. A child's spine is still developing, so it isn't as resilient as an adult's spine.
Parents might want to check in with the school coaches and see if they have an up to date understanding of the way children should be training. When your child comes home at night, pay attention to when he or she seems overly fatigued. Children don't experience fear and caution the way adults do, so they won't necessarily know when enough is enough.
Sports are highly beneficial to childhood development, both mentally and physically. Low back pain isn't a threat to a child's well-being, as long as you know when to take action if necessary.