Correlation vs Causation

The following headline caught my eye recently:

“Migraines could be caused by gut bacteria, study suggests”

The Guardian – 18/10/16

To anybody who suffers from migraines, this is very interesting; at the moment, we really don’t understand what causes them. If a study has figured this out, then we may be able to help the estimated 15% of the population who are sufferers.

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