If it is the former, then this dream means the same as losing your teeth: it means that you have been suffering from someone or something recently, and it is almost to the limit. This situation in your dream is similar to your real diarrhea, that is, you release the negative energy of patience in your dream, which is a protective measure for your health, so this dream is also a good dream.
Of course, this dream has a lot to do with age. If it's the elderly, that's another matter, so I won't talk about it here.