Spasm in the lower, large intestine

On rare occasion I will have a painful spasm in my lower large intestine.  It is painful enough that I break out in a sweat and am a bit light headed and nauseated from the intensity.  It passes and everything is fine, so I have just ignored it (well, at least after it's over).  There's no pattern to when this occurs.  I'm not all that concerned, but just wondering if there might be a trigger?  

[Ratnakar Kini, MD]

Hi,
If bowel movements cause relief of this pain, it could be due to irritable bowel syndrome.
If it occurs during sleep also, have bloody diarrhea, weight loss, then IBS is ruled out and you need to be evaluated by a gastroenterologist.