This is the only protection that is has against traumatic blows. When you hit your head against something with a hard enough impact. This small layer of fluid is not enough protection. The brain can hit the inside of your skull and a bruising can develop, and an inevitable bruising can happen on the opposite side of the brain when the brain snaps back into place. The brain can twist and rotate too depending on how the impact occurred, straining the nerve cells in the brain, and permanently losing the ability for the nerves to communicate with the rest of the body. When a concussion occurs, we cannot sense anything for a moment and paralyzes the nervous function in your brain. Thankfully this paralyzes is reversible, and goes away shortly after the impact occurs. Strangely enough, you do not have to be unconscious for a concussion to occur.
No two people will recover the same and everyone experiences concussions differently. It can take days, weeks, and on rare occasions sometimes months. Concussions are not completely healed until all of the symptoms are completely gone. The brain can handle one concussion and heal perfectly fine, but when you suffer two or more concussions, your chances for experiencing serious neurological problems increase. The brain cells need time to recover and to return to normal after a single concussion. Multiple concussions make recovery time a lot longer, and the nerves may not even fully