With 26 percent of Americans 18 years or older living with a diagnosable mental disorder, it's no wonder mental health is an increasing priority for the average person. But what about the celebrities or famous people we've come to follow so closely? They aren't exempt from mental health issues, either. Some are more private about their mental health, while others strive to raise awareness in hopes of debunking misconceptions about disorders. This slide show includes some of Hollywood and history's most well-known names.

Catherine Zeta Jones may be the new face of bipolar II disorder, but it's no role she hoped to land. Despite now speaking publicly to help remove some of the stigma that comes with the condition, who's to say Jones would've done so it if reports of her treatment hadn't gotten out? "She went to go get some help and some other patient probably in there said, 'Hey, you won't believe who's in here now,'" husband Michael Douglas said during an interview on "The Oprah Winfrey Show." What's the difference between bipolar I and II? According to WebMD, they possess many of the same characteristics -- the highs and lows -- but with bipolar II, the person never reaches full-on mania.

Next, was it manic depression that made Mad Max so sad? 

 

Celebrities with Mental Health Disorders

 

Long before he was winning Oscars -- or making headlines for all the wrong reasons -- road warrior Mel Gibson was doing battle with an unseen, off-screen foe: bipolar disorder. Known for his onset pranks and proclivity for after-hours partying, Gibson broached the subject during a 2002 documentary interview with a former classmate. "I had really good highs but some very low lows," Gibson told filmmaker Sally McKenzie for "Acting Class of 1977," which aired on Australian television in 2008. "I found out recently that I'm manic depressive." Numerous articles have been written, linking bipolar mood disorder with artistry. In 2008, a study at the Stanford University School of Medicine found that those with the condition expressed "enhanced creativity," but recommended more research to determine why.

Next up - this pretty face fought serious depression after the birth of her daughter. Who is it? Keep reading.

 

Celebrities with Mental Health Disorders

 

Some celebrities, such as actress and model Brooke Shields (pictured at right) have even written about their experiences. Shields has publicly discussed her bout with postpartum depression after the birth of her daughter in 2003. Lasting longer than your typical "baby blues," postpartum depression includes prolonged feelings of anxiety, worthlessness and restlessness in new mothers. She said that at one point, she "didn't want to live anymore" because her depression was so severe. The actress sought treatment early on and learned to manage her disorder with professional help and medications.

Click on to see how a Nobel Laureate learned to live with schizophrenia. 

 

Celebrities with Mental Health Disorders

 

Many people hail John Nash as an economic and math genius, especially after he won the Nobel Prize for economic sciences in 1994. But what many people didn't know at the time was that Nash lived with paranoid schizophrenia, a mental health disorder in which people have difficulties telling what's real and what's not, affecting their social responses and ability to think logically at times. During an interview with the Public Broadcasting Service, Nash said his periods of paranoia (during which he heard voices) reflected his wishes to have a more influential role in studies and the world. "People are always selling the idea that people who have mental illness are suffering," he said, proposing that mental health disorders are often misunderstood. Nash said he has made adjustments to live with schizophrenia, which allowed him to continue his life work. His struggle with the mental disorder also inspired the award-winning film "A Beautiful Mind" in 2001.

Click on to see which Star Wars starlet went public with her mental health disorder. 

 

Celebrities with Mental Health Disorders

 

We're familiar with the Carrie Fisher who donned the Princess Leia buns in the Star Wars trilogy, but offscreen may be a different story. Fisher has struggled with substance abuse and bipolar disorder, she told ABC News in an interview. Bipolar disorder is characterized by severe mood and energy shifts that affect people's ability to do daily activities. Fisher talks publicly about her disorder, telling ABC News Primetime she had "outlasted" her problems. "I am mentally ill. I can say that. I am not ashamed of that," she said.

On the next page, see which Academy Award-winning celebrity has recently spoken about her struggles with depression. 

 

Celebrities with Mental Health Disorders

 

Along with 20 million people in the U.S., British actress and screenwriter Emma Thompson has dealt with depression. In an interview with the Daily Telegraph, Thompson said she battled clinical depression in the past, with her career saving her from "going under." Like other people living with clinical depression, Thompson said she felt sad and hopeless, and was unable to get out of bed at times.

Up next: a football player with personality -- many of them, actually. 

 

Celebrities with Mental Health Disorders

 

In recent years, Herschel Walker, a Heisman award-winning running back and former NFL player, has gone public about his troubles with dissociative identity disorder, a complex mental health disorder. People with DID are influenced by two or more distinct personalities, or identities, which prevent them from acting like themselves. Walker has received treatment for the disorder and wrote a book about his experiences. "I feel the greatest achievement of my life will be to tell the world my truth," he said in an interview with ESPN.

Click on to see which Olympian was diagnosed with ADHD.

 

Celebrities with Mental Health Disorders

 

Olympic gold medalist swimmer Michael Phelps has risen to stardom at a fairly young age,and Deborah Phelps, Michael's mother, said she wanted to share Michael's story and his struggles with attention deficit hyperactivity disorder (ADHD). Diagnosed when he was 9 years old, Phelps had trouble concentrating in school, his mother said, but personally prescribed medication and swimming helped Phelps manage the disorder.

Next, see which industry titan lived with obsessive compulsive disorder. 

 

Celebrities with Mental Health Disorders

 

Howard Hughes -- known for his wealth, movie production and aviation skills in the early and mid 1900s -- was always in the spotlight for one thing or another. But, ultimately, he is also remembered for his struggle with obsessive compulsive disorder, a condition that causes a combination of unnatural obsessions, anxiety and compulsions, which usually are acted out in repetitive behaviors. Unfortunately, Hughes' OCD led to isolation, increased drug use and his own death, according to the British Broadcasting Company. Notably, his obsession with cleanliness and reputation as a "germaphobe" were evident in his daily life and interactions with his employees. In one repetitive routine, he made his workers use several facial tissues and rounds of hand-washing just to fetch his hearing-aid cord. His career and personal battle with the disorder inspired the 2004 Oscar-winning film "The Aviator." Anxiety is also no stranger to this next celebrity.

Click onward to see which cooking icon has fought panic attacks for years. 

 

Celebrities with Mental Health Disorders

 

Paula Deen is a woman of Southern charm and authentic, real-butter cooking. But Deen had a hard time doing away with her panic attacks and agoraphobia, she said in an interview on the Larry King Live television show. Agoraphobia is when people fear places they know may lead to a panic attack, especially in situations that are difficult to leave. Deen said her attacks began after her father's death, and continued for nearly 20 years. She wouldn't leave the house without a brown paper bag to breathe into in case she had an attack. "I never knew when they were going to hit me, but it's the most terrifying, uncontrollable feeling," she told King. Deen eventually overcame her panic attacks and agoraphobia on her own, but it's common for people with panic attacks to seek professional help.

On the next page -- Elton John and his personal struggles with a mental health disorder. 

 

Celebrities with Mental Health Disorders

 

Music star Elton John discussed his uphill battle with substance abuse and bulimia on Larry King Live in 2002. Bulimia is an eating disorder in which people binge, or uncontrollably consume large amounts of food, and then expel the food by vomiting or using laxatives because they don't want to gain weight. Discussing his substance abuse and bulimia, John said he had been "sober and clean" years. "And it was the best thing I ever did. But, you know, those three words -- I need help. If only I'd said them earlier," John explained.

Next, see which late-night celebrity has come clean about his drinking problem. 

 

Celebrities with Mental Health Disorders

 

Craig Ferguson's late-night wit and shenanigans are a must-see for many, and Ferguson occasionally pokes fun at his stint with alcoholism. He's been sober for the past 18 years and has talked publicly about his embarrassing and emotional experiences dealing with his addiction. After submitting himself to a rehabilitation clinic, he found a new perspective in life. "I think what rehab did for me is it began that journey for me, which is a journey to try and get a sense of perspective about myself and where I exist in the world," he told Larry King in 2009. More than 17 million adults in the U.S. have alcohol-related problems. As demonstrated with Ferguson, treatment can be very effective.

According to Hank Williams Jr., even the man of steel can get the blues. But what about Lois Lane? Keep reading.

 

Celebrities with Mental Health Disorders

 

In the 1970s and early '80s, Margot Kidder was the Man of Steel's No. 1 lady, portraying Lois Lane opposite Christopher Reeve's Superman in the superhero film franchise. But by the 1996, manic depression and paranoia gripped the actress in a well-publicized nervous breakdown in which she cut her hair to avoid being recognized and went missing for days before being found hiding in a suburban California backyard. After being discovered by police, Kidder was taken to a psychiatric center for observation. In the years that have followed, Kidder bounced back to land several TV and movie roles and to speak publicly about mental health and alternative treatments, like acupuncture. "I'm now ferociously healthy in body and mind," she told The Guardian in 2005. "You couldn't pay me to go near a psychiatrist again. Stopping seeing them was my first step to getting well."

Up next, this controversial singer beat suicidal thoughts with medication and therapy.

 

Celebrities with Mental Health Disorders

 

Maybe you remember Sinead O'Connor from her 1990 "Nothing Compares 2 U" video, the close-up shot and somber blue lighting. Or perhaps your image of the Irish singer recalls her ripping a photo of Pope John Paul II on an episode of Saturday Night Live in 1992. To O'Connor, the notion that she always had to be controversial proved to be an artistic impediment, and she took a step back. In a 2007 interview with The Times of London, the now 44-year-old singer and mother of four reveals how treatment for bipolar disorder helped mend what she calls a hole in the center of her being, with symptoms that included suicidal thoughts as far back as age 23.

Coming up, a revolutionary rocker whose death is now used to reach out to teens contemplating suicide. 

 

Celebrities with Mental Health Disorders

 

In 1994, alternative rock icon Kurt Cobain joined the so-called 27 club -- an unfortunate group of singers and musicians such as Jim Morrison, Jimi Hendrix and Janis Joplin, to name a few, who all died at 27 years of age. Cobain's death left many asking why? Did depression drive him to suicide? Why would someone check out at the height of professional success? Though we may never have all the answers, for Beverly Cobain -- the singer's cousin and a registered nurse with a background in mental health work -- sought to turn her family tragedy into an opportunity to reach youths contemplating suicide. "Kurt was diagnosed at a young age with attention deficit disorder, then later with bipolar disorder," Beverly said in an interview with CVS Health Resources, later adding, "As Kurt undoubtedly knew, bipolar illness can be very difficult to manage, and the correct diagnosis is crucial. Unfortunately for Kurt, compliance with the appropriate treatment is also a critical factor."