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However, one answer to "what is a headache" is that it could be a symptom of another illness that may be causing the headache. These can include:Tumor ,Abscess ,Hemorrhage, Hydrocephalus (abnormal build-up of fluid in the brain) ,Blood clots ,Head trauma ,Sinus blockage or Aneurysm. There are many more and im sure someone who know a lot more than i do will post a better answer than i have. or correct what i have said.Paul