New research has found that people with Attention Deficit/Hyperactivity Disorder (ADHD) are significantly more likely to also exhibit hoarding behaviors, which can have a serious impact on their quality of life. The study, published in the Journal of Psychiatric Research and funded by the British Academy and the Leverhulme Trust, found that almost one in five people with ADHD exhibited clinically significant levels of hoarding, indicating there could be a hidden population of adults struggling with hoarding and its consequences.