If your head or body is hit hard enough, the soft tissue of your brain, which is cushioned by spinal fluid, can crash into the hard bones of your skull and become bruised and damaged to varying degrees. Doctors generally rate the severity of a concussion by grades, depending on the symptoms that are displayed and how long they last.

With lower-grade concussions where there is no loss of consciousness, the person may not even realize they have suffered an injury. Often, any confusion, memory loss or disorientation is short-term, any may go away in less than 15 minutes, so the symptoms can be easily overlooked or dismissed.

Common signs of concussion include:

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