A somber warning for parents: A new study suggests that concussions in high school athletes may be a risk factor for suicide.

Concussions are the most common form of traumatic brain injury. Symptoms include loss of consciousness, headache, dizziness, nausea, confusion and changes in mood.

Boston 25 News anchor Scott McDonnell spoke to Dale Mantey, the lead author of the study and a doctoral student at the University of Texas School of Public Health.