Experts are still unsure whether kids' concussions -- especially multiple concussions -- can raise their risk of degenerative brain conditions, such as Alzheimer's disease, later in life.
Podell noted that it's an important but difficult question to study. "You have to look at people over decades," he said, "and many other things happen in a person's life over those years."
Learn more about concussions from the U.S. Centers for Disease Control and Prevention.
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