ADHD can have significant consequences if left untreated. Inattentive symptoms may make it more challenging for someone to hold on to a job or maintain healthy relationships, while hyperactive and impulsive symptoms may cause risky and even deadly behavior. Research has found that adults with untreated ADHD, for example, are more likely than their treated counterparts to abuse substances, engage in unprotected sex, experience unplanned pregnancies, get into car accidents, or have trouble with the law. Indeed, some research suggests that more than a quarter of people in prison have ADHD, most of which is untreated. Securing a diagnosis and pursuing treatment can thus help someone with ADHD live a healthier, happier life.