They’ve got “migraine” listed there with a prevalence of 1 billion and “tension headache” listed with a prevalence of 2 billion. That’s making the numbers add u

They’ve got “migraine” listed there with a prevalence of 1 billion and “tension headache” listed with a prevalence of 2 billion. That’s making the numbers add up, because that’s 3/4 of the supposed sufferers of neurological disorders, yet most people would hardly group them into that category, and the vast majority of people who get them don’t suffer close to the debilitating effects of Alzheimer’s or Parkinson’s.