Depression remains an ongoing problem in the U.S. as historically high rates persist, polling company Gallup reveal s.

The reported percentage of U.S. adults suffering or receiving treatment for depression has been higher than 18 percent for the past two years. A decade ago, in 2015, the number was just over 10 percent.

"The increase is alarming, and it is important that we keep an open mind and explore all possible causes for the rapid, and apparently sustained, rise in depression rates over the past decade," Dr. Gerard Sanacora, a professor of psychiatry, director of Yale Depression Research Program and co-director of Yale New Haven Hospital Interventional Psychiatry Service at Yale University, told Newsweek .

Why It Matters

Depression is a common mental health condition that can

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