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.
Daughter (22) Dx'd Crohn's 3/06. Misdiagnosed for two years, including by top pediatric Crohn's specialist as stress. No symptoms for the past three years. March '09 colonoscopy showed stricture gone but two spots of inflammation in TI. Used LDN to taper off Entocort last fall. (Was on Entocort since April 06.) Never had D. 4.5 mg LDN, SCD multivit, homemade yogurt, 5000IU vit D3, 1000 mg calcium, 27-54 mg iron, monthly B12 shots, daily oral B12 1000, 10mg zinc. SCD diet modified years ago to include potatoes and rice.