An estimated half of the concussions sustained by children in sports and recreational activities go untreated, according to a new study.

The University of Washington, along with the University of Colorado and the Seattle Children’s Research Institute, reported that 1.1 – 1.9 million U.S. kids sustain concussions through sports or other recreational activities yearly. But the study claims that only half of them are reported to a doctor, leaving almost 1 million children to go untreated.

This is a deeply disturbing number, especially when considering the likelihood of multiple concussions in some sports and activities. Even if we assume a generous margin of error, the sheer volume of children suffering concussions is stunning. That half of them are going unacknowledged, given what we now know about how concussions can affect long-term health, is cause for serious alarm and self-evaluation. Coaches, parents, organizers, and players should all look at how they can be more vigilant about head safety and concussion spotting. Maybe next year, 1 million heads won’t fall through the cracks.

*Scientists have no conclusive evidence as to whether or how the reduction of g-forces during impacts reduces the number or degree of concussions and head injuries. GelDefender products provide supplemental padding as well as cooling and comfort benefits when used with helmets and caps. Participants in activities in which head impacts can occur should always use tested and approved helmets for protection. However, no helmet or supplemental padding can protect the user from all serious head or neck injuries that can result from impacts.