But what many fans don't know is how much he suffers from a crippling fear of germs -- something he has joked about before, but never spoken seriously about until now. The year-old "Deal Or No Deal" host suffers from obsessive compulsive disorder or OCD -- a debilitating anxiety disorder that produces inescapable repetitive thoughts. Like many of the 4 million adults who suffer from OCD, Mandel's most frequent obsession is germs , but can manifest itself in countless ways that trigger a silent loop of the question 'What if It is quickly evident that Mandel is a gracious family man who loves to entertain, is living his dream, albeit in constant fear. On the set, instead of shaking hands , Mandel does the fist bump -- his trademark greeting on "Deal Or No Deal" -- to work around his germ anxiety. Otherwise I would spend the day, as I have in the past in my life in the men's room rubbing and scrubbing and scalding," he said.

According to BeyondOCD. If you suffer from OCD, the numbers prove that you are far from alone. In fact, many celebrities who struggle with OCD have talked openly about their disorder in an attempt to eliminate the stigma around mental health illnesses. Anyone who deals with OCD can create a successful life while managing their condition, and these celebrities are proof.

Attention deficit hyperactivity disorder ADHD is a neurodevelopmental disorder. In a parent report from , the Centers for Disease Control and Prevention report that close to 11 percent of American children ages 4 to 17 have been diagnosed with ADHD. However, more than half of children with ADHD continue to experience symptoms as adults.