That’s the title of a little interview with Willoughby Britton found on Mindful.org. Here’s their brief bio:
Willoughby Britton is Assistant Professor of Psychiatry and Human Behavior at Brown University Medical School. She has also been a committed mindfulness practitioner for 20 years.
She talks about the often untalked about experience that many people will experience meditating — unpleasant emotional material can resurface with a surprising force. In other words, for some people some caution should be exercised while embarking on the meditative path.