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In some cases injuries to the brain from trauma, brain tumors and stroke can lead to a diagnoses of ADHD. However claims such as diet, vestibular dysfunction, over use of television and bad parenting have not yet been proven to be leading causes of ADHD. ADHD can cause many symptoms which fall into different categories predominantly inattentive type, predominantly hyperactive-impulse type, and a combined type for those with symptoms from both classifications. Symptoms from the predominantly inattentive type, which is more commonly in females, being easily distracted, difficulties focusing, becoming bored with a certain task within the first five minutes of beginning, appearing not to listen when spoken to, difficulties following instructions, difficulties processing information quickly and accurately. Those with the predominantly hyperactive-impulse classification suffer from symptoms including fidgeting, constant talking, having difficulties remaining still, remaining constantly in motion, becoming very impatient, and remaining quiet during activities and becoming easily distracted.