Inattentiveness Hyperactivity and impulsiveness Being forgetful about completing tasks Being easily distracted Making careless mistakes Being unable to stick to tedious or time-consuming tasks Constantly changing activity or task Having difficulty organizing tasks Having difficulty sitting still Acting without thinking Interrupting people while they’re talking Excessive physical movement Excessive talking 
Genetics Environmental factors Development disorders Brain malfunction 
Clinical Psychologist Geneticist Psychiatrist Pediatrician
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