When it comes to head injuries, knowing when to seek emergency medical care for yourself or another person can be life-saving. Here's what you need to know.
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I hit my head on the edge of a cabinet pretty hard about 12 hours ago, I feel normal, but there's a bump, should I go to the doctor or ER? - Quora
What to do if you hit your head, according to trauma experts : NPR
Doctors Are Sharing What to Do and What Not to Do When You Hit Your Head