Presidential candidate Rep. Seth Moulton, D-Mass., and Sen. Tina Smith, D-Minn., recently delivered confessions that are rare for members of Congress: They once struggled with and were treated for mental health conditions, he for post-traumatic stress disorder and she for depression.

Discussing such problems out loud is a gamble in politics, and over the years few others in Congress have been forthcoming, but the chances are high that a number of politicians have faced mental health problems. An estimated 47 million people in the U.S. in any given year struggle with conditions such as anxiety or depression. Of those, 11 million have more serious conditions such as bipolar disorder or schizophrenia, according to the National Alliance on Mental Illness.