I was once working with a child who was also seeing a psychiatrist. Like many children with whom I work this child had numerous diagnoses: ADHD, Bipolar Disorder, Anxiety Disorder and Intermittent Explosive Disorder. However, when the mother would describe the child's behavior I would instantly think "trauma". I kept saying this to her, but she was swayed by the authority of the doctor and maintained his belief the child was mentally ill. Until her child told her he had been sexually and physically abused.
Survivors of trauma, especially childhood abuse, often use numbing as a technique for dealing with strong or painful emotions.
Many children with whom I work I have been labeled "ADHD" and placed on medications in an attempt to control their "acting out" or their "meltdowns" or their "behavior problems" at school.