The truth is that about two-thirds of children with ADHD not only have problems with attention and mobility, but also have other psycho-behavioral problems called co-morbidities. ADHD with co-morbidities can be more difficult to treat, and sometimes a combination of other medications or psychotherapy is needed to deal with the co-morbidities. Common ADHD co-occurring disorders include: Oppositional Defiant Disorder: Challenging authority, deliberately disobeying adults, and a tendency to provoke others. Behavioral disorders: behavioral problems are more prominent and significant, with frequent challenges against social rules, stealing, truancy, fighting, and cruelty to small animals. Emotional problems: always worrying, thinking and worrying a lot; or always moping, unhappy for a long time because of small things. Tourette’s syndrome: involuntary movement of certain muscles, such as blinking, sniffing, pouting, nodding, bobbing the head, shrugging the shoulders, flinging the hands, or making certain fixed syllables.