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The illness increases family problems and can cause financial hardship : The multiple medications and interventions required by patients are not always covered by health insurance plans . Our experience has shown that medication by itself leads to improvements , but not always to functional speech , which is the ability to speak in almost all settings in which it is appropriate and required . This theory of ADHD predicts that most hyperactive and fidgety behaviors are the result of this intrinsic impatience . Social rewards help the child who has been isolated learn that smiles and pleasant statements from others are good things that can be enjoyable . Initially , the venom proteins promote massive blood clotting , which leads to headaches , dizziness , and vomiting . But then , of course , the prey re-evolves resistance , and so on . " This explanation of ADHD predicts that most of the impulsive symptoms are the result of difficulties in stopping a planned action or thought . These are the measurable characteristics that might predict the risk of ADHD in the same way that serum cholesterol predicts the risk of heart disease . Working in Arctic frequently requires living in isolated tent camps up to 300 miles away from any supply base , so doing research there happily leads not only to novel scientific discoveries but to adventures as well . That number increases to 5,000 when you broaden the range to include young adults up to age 24 .