David Z. Hambrick, Madeline Marquardt:

There are advantages to being smart. People who do well on standardized tests of intelligence—IQ tests—tend to be more successful in the classroom and the workplace. Although the reasons are not fully understood, they also tend to live longer, healthier lives, and are less likely to experience negative life events such as bankruptcy.
Now there’s some bad news for people in the right tail of the IQ bell curve. In a study just published in the journal Intelligence, Pitzer College researcher Ruth Karpinski and her colleagues emailed a survey with questions about psychological and physiological disorders to members of Mensa. A “high IQ society,” Mensa requires that its members have an IQ in the top 2 percent. For most intelligence tests, this corresponds to an IQ of about 132 or higher. (The average IQ of the general population is 100.) The survey of Mensa’s highly intelligent members found that they were more likely to suffer from a range of serious disorders.
The survey covered mood disorders (depression, dysthymia and bipolar), anxiety disorders (generalized, social and obsessive-compulsive), attention-deficit hyperactivity disorder and autism. It also covered environmental allergies, asthma and autoimmune disorders. Respondents were asked to report whether they had ever been formally diagnosed with each disorder or suspected they suffered from it. With a return rate of nearly 75 percent, Karpinski and her colleagues compared the percentage of the 3,715 respondents who reported each disorder to the national average.