1. Part 4 Concussions Causes blunt force trauma to the head fall
car accident
sports injury
being struck on the head with an object.

2. How Your Brain Can Get Hurt
A hard blow to the head can shake the brain inside the skull
resulting in bruising
broken blood vessels
nerve damage to the brain
When you take a hard hit to the head but there's no outward bleeding or opening in the skull, could result in a closed brain injury
An open brain injury is when an object penetrates the skull and goes into the brain.

3. Brain Injuries: Mild vs. Severe
A TBI can be mild or severe.
A concussion is a mild TBI -- you should recover pretty quickly.
A severe TBI can do enough damage to knock you unconscious for a longer period of time. It can even lead to a coma or death.

4. How Do You Know It's a Concussion?
After a fall or hit to the head, you may be knocked out for a few seconds.
A few telltale symptoms will show that you may have a concussion.
Dizziness, nausea
vomiting
blurry vision
headache
trouble thinking clearly are all signs that you need to see a doctor to get your head injury checked out.

5. Long-Term Effects of Brain Injuries
A serious brain injury can stick with you for life
Problems thinking
moving
controlling your emotions.
There's some evidence that having a TBI increases your risk for Alzheimer's disease, Parkinson's, and other brain disorders as you get older.

6. Prevention and Recovery from Any Brain Injury
For mild injuries like concussions, the best therapy is to rest and give your brain a chance to heal
Physical, occupational, and speech therapy can help with the physical and mental side effects of severe brain injuries
Counseling sessions with a psychologist or psychiatrist can help you learn to live with your injury