Although I don’t always agree with her, I admire Hillary Clinton greatly – and we have a few things in common. We both grew up in the Chicago suburbs, are Democrats, and have just one beloved daughter, but now we have one more thing in common. Ironic that when I wrote a press release for a journal article on concussion less than a month ago and mentioned Hillary, that I would be joining her as a concussed patient. I have been researching and writing about this topic since 2004, and I suddenly find myself experiencing this type of traumatic brain injury firsthand. The most underreported, under diagnosed and underestimated head injury is concussion, accounting for 90 percent of traumatic brain injuries, with the number of cases ranging in the millions every year. The brain is a soft organ that is surrounded by spinal fluid and protected by the hard skull. Normally, this fluid acts like a cushion that keeps your brain from banging into your skull. But if you hit your head or body hard, the brain can crash into your skull and sustain an injury.