It makes you cringe, you say? I need more information to accurately diagnose your problem.....
How often do you experience the cringing? How long does the cringe last? How much time passes between cringes? Has there been any changes in your diet? Are you drinking plenty of water? Are you tilting your clearomizer? These cringes could indicate the onset of a much more serious problem.
Maybe more like a twinge? Give me the news straight Doc, don't pull any punches.