Phoebe, do you know where your Crohn's is located? Mine is confined to my small intestine. However, the pains and the gurgling, bubbling feeling I've been getting have all been on the left side as well. BUT, I know why.
As Bektold stated, the descending colon pretty much runs up the left side of your body. You have to think of your digestive system from the top down, i.e. from mouth to anus. So the colon STARTS in the lower right quadrant at the ileocecal valve w/the cecum, then the ascending colon running up the right side, the transverse colon running across the body below the stomach, the descending colon running down the left side of the body, the sigmoid colon running across to the center of the body, the rectum running down the center of the body to the anus.
The intestine is kind of like a slinky. That's why and how we can have 20 feet of small intestine packed into our abdominal area. The last 3 feet of the small intestine is what is referred to as the terminal ileum. It is 3 feet if it is stretched out, but of course, it isn't, remember the small intestine is like a slinky.
When my Crohn's first struck, unlike the majority of us, it struck me at the proximal (top) end of the terminal ileum, rather than at or near the ileocecal valve which is the bottom end of the small intestine. I had to have 18 inches of my small intestine resected at and above that area where it first struck. And it is that area that has narrowed since the resection and is causing the pain, gurgling and bubbling sensation on my left side.
Now my narrowing after all these years is almost all scar tissue so I'm not too far away from another resection. You might say I am running out of borrowed time until my next (second) resection. But, hey! I've had a good run ... 20 year remission after that resection and then 10 years of pretty well controlled by medication symptomatic remission. Until just this past year of minor symptoms.
In your case, you most likely have a narrowing in the area on the left where you are experiencing your symptoms, but most likely, depending how long you've had Crohn's and how well its been treated up to now, your narrowing there is inflammation and should respond to an increase or change of meds. Certainly you need to discuss this w/your gastro.
Good luck and God bless!
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.