The noise can be caused by a stricture, due to inflammation and/or scar tissue.
We used to be able to hear my daughter clear across the room - even before she was formally diagnosed with Crohn's. After she started eating yoghurt, the sounds quieted down substantially.
Today, she makes homemade yogurt, aged 24 hours (per the SCD diet) and eats it every day...we think of it like medicine.