Americans are more depressed now than they were a few years ago and the numbers have also increased, a new study finds.

The study was conducted by San Diego State University psychology professor Jean M. Twenge. She examined data from 6.9 million adolescents and adults from all over the country and found that Americans now report more psychosomatic symptoms of depression, such as trouble sleeping and trouble concentrating than their counterparts in the 1980s.

"Despite all of these symptoms, people are not any more likely to say they are depressed when asked directly, again suggesting that the rise is not based on people being more willing to admit depression," said Twenge.

The study authors found that teens of 2010 were 8 percent more likely to have trouble remembering, 74 percent more likely to have trouble sleeping and twice as likely to have seen a professional for mental health issues than their 1980s counterparts.

"Previous studies found that more people have been treated for depression in recent years, but that could be due to more awareness and less stigma," said Tweng in a press statement. "This study shows an increase in symptoms most people don't even know are connected to depression, which suggests adolescents and adults really are suffering more."

The study also found that the suicide rate for teens decreased, though the decline was small compared to the increase in symptoms of depression. The doubling of the use of antidepressants may have something to do with this.

Twenge's findings were published in the journal Social Indicators Research.