In general, it is true that these are safe procedures. But safety is a relative term. While the familial polyp conditions are more commonly identified in children, the diagnosis may sometimes not be made until the thirties or forties. This is because some of these cases occur sporadically by mutation of the gene involved rather than inheriting a mutated gene. Oldest patient identified to have familial polyposis was diagnosed in his seventies.
Diarrhea is a very imprecise term and means different things to different people.
Most precisely, it is defined in terms of weight of the stool. If the 24 hour stool output exceeds 200 g, person is said to have diarrhea. Others include in the definition an increase in fluidity, frequency and volume of stool output. Some patients refer to diarrhea as urgency to defecate as well as stool incontinence etc. Perforation of the bowel may occur at any site of the digestive tract.