What is a concussion?

As Will Smith made evident, concussions are more than a "bump on the head", way more.  What's also unusual is that a concussion can be received with impact to another part of the body, not even the head.  What's also unusual is that a concussion can be received with impact to another part of the body, not even the head.
If you're hit on your body somewhere, that makes your head move, sharply, to one side and then back, your brain hits your skull, and it's like hitting your head with a hammer.
If your kid is hit on the head by the ball in the game, and gets a big bump, it's more often than not simply a visible injury, and not a concussion. However, make sure that you pay attention to your kid, periodically ask them random questions that take a moment to think, and make sure they're alert.
Make sure that you take your kid to see a doctor if they show:
• Persistent or worsening headache• Imbalance
• Vomiting• Memory loss or confusion
• Mood changes, such as irritability
Signs and symptoms may not be noticeable right away,
but if your headaches, dizziness, confusion, and nausea persists,
you should see a doctor.