This report is the second report under the 2014 NSDUH National First Release Reports. This report presents findings from the 2014 NSDUH on the percentages and numbers of adults aged 18 years old or older in the United States who had serious thoughts of suicide, made a suicide plan, and attempted suicide in the past 12 months. Findings for 2014 are presented for all adults aged 18 or older, young adults aged 18 to 25, adults aged 26 to 49, adults aged 50 or older, and adult males or females aged 18 or older. Trend data for suicidal thoughts and behavior also are presented by comparing estimates in 2014 with estimates in 2008 to 2013. Statistically significant differences are noted among subgroups of adults in 2014 and for differences between estimates in 2014 and those in prior years.