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Recent head or neck injury;
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Recent surgery;
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A history of thrombosis or embolism: the client should speak with their doctor;
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Very high or low blood pressure;
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Recent hemorrhage or excessive bleeding;
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Nervous system disorders (polio, meningitis, MS, encephalitis);
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Severe localized bruising;
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Localized open cuts or wounds on the upper back, neck, head or face;
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History of seizures or convulsions;
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Contagious skin disorders and infections;
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Active cancer.
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