Attention deficit disorders are typically thought of as a “little-boy thing, but according to a study in The Journal of Clinical Psychiatry, diagnoses of attention deficit hyperactivity disorder shot up 55 percent for girls between 2003 and 2011. In those same eight years, 40 percent more boys were diagnosed. Among women ages 26 to 34, ADHD prescriptions spiked up 85 percent between 2008 and 2012 alone.

While ADHD diagnoses on their own may not seem all that troubling at first glance, experts note that ADHD plays out very differently in girls and can lead to very different, “horrendous” outcomes for women, Ellen Litman, a clinical psychologist and co-author of Understanding Girls With AD/HD, told Quartz. Writer Jenny Anderson explains the gender differences: Unlike boys, many of whom show hyperactivity, girls’ symptoms veer more toward inattentiveness and disorganization. Girls tend to develop ADHD later than boys. They frequently mask it in an attempt to conform to society’s expectation that they be on the ball and organized. And while some ADHD symptoms can become less intense for boys after they pass through puberty, for many girls, it gets worse.