Hi there, the chemo nurses can provide loperamide tablets to help with this along with anti-nausea tabs, you could check that your mum is telling the team that she is suffering, it could lead to dehydration.
The capecitabine gets turned into flourouricil in the body (5Fu) and this acts on all fast dividing/replicating cells - on the cancer cells but also those in the digestive tract from the mouth all the way down to the anus. The effects can get worse as the treatment progresses - fortunately these side effects can be managed easily, I saw them as a sign that the chemo was doing its thing and destroying those nasty cancer calls. There are also numbing creams that can help with any soreness on the bottom - germoloid cream is a good one. This is a very good forum but I recommend that you and your mum join the Bowel Cancer UK forum, there are a lot of info leaflets about treatments, what to expect, questions to ask etc. There are colorectal specialist nurses you can ask for info and a it is a safe and supportive place xx
It also has a private section for relatives/friends xxx

Hello OFJ,

                  a good clear informative post, unfortunately one that stirred up memories of a forgotten unforgettable period of my life,Time dulls the memory,but the sharp focus came rushing back reading your post.At least l can manage a wry grin,

                                                                   David