90% of North Americans suffer from headaches. Some are dull and throbbing, and some cause debilitating pain and nausea. Chiropractic care may be an effective treatment option for headaches. More than 90% of headaches are primary. These include tension, migraine, cervicogenic (originating from tension in the neck) and cluster headaches. Secondary headaches result from other medical conditions, such as infection or increased pressure in the skull due to a tumour. These accou