Michael Marshall Smith, from: "Only Forward" http://www.goodreads.com/author/show/12339.Michael_Marshall_Smith
Mindfulness practice involves physically processing "Bad Things", as they surface. We do so by meeting all the various challenging physical feelings (that naturally arise, stay a bit, then dissipate), with curiosity, acceptance, patience, and if need be, perseverance. It's important not to weave stories about these physical sensations. Physical discomfort is much, much easier to accept & manage than mental/emotional suffering.
Mental/emotional suffering is created when we decide to create a long, painful story (self-talk) about the physical sensations. This unskillful, yet extremely common addition can maintain both physical and mental/emotional suffering for as long as we "keep picking at the scab".
So instead, we intentionally let go of words & images, and directly experience with curiosity, and kind acceptance, all phenomena - which then behave naturally - ie are transient.