Is gastrointestinal fistula a complication of Crohn's disease?

Yes. Crohns results in full thickness[transmural] inflammation with can cause abscess or fistula.
Yes. A fistula is a connection between two distinct organs or structures. Some people with crohn's disease are prone to fistula formation, whereby the affected portion of the intestine can bore a hole ito an adjacent organ (intestine, bladder, vagina) or the skin. These fistulae almost always require definitive surgery.

Related Questions

I have Crohn's disease. How can I tell the difference between an anal fistula (had one surgically removed 10 years ago) and a hemorrhoid?

You can not but. Your doctor can , due to training and experience . When crohn's disease involves anorectal area , recurrent fistulas , infections , pain , drainage , local infections are common , make the diagnosis difficult , tissue biopsy ( pathology ) is the only way to distinguish from other conditions. Read more...

Hemoglobin test in urine came out positive. Should I be concerned? I do have Crohn's Disease that causes vaginal fistulas, but it is not active.

Hematuria. With your history of fistulas you should consult your doctor. Read more...
Unrelated. Crohns disease, an inflammatory condition of bowel is intramural and not mucosal. As such as it extends it does fistulize to bladder and vagina, but if not active the source of hemoglobin must be defined. Is this Hgb in the urine or red blood cells. Hemolysis of blood can wind up in urine from some allergic process. RBC in urine can arise from kidney, ureter or from lining of bladder. Read more...
Yes. Assuming you have true hemoglobinuria. You should see a doctor to determine the true cause of hemoglobin in urine. Blood transfusion and stenous excercise can cause transient hemoglobin in urine. Hemolysis,PNH, or infection (malaria),or kidney disease, or tumor can also cause hemoglobin in urine. In addition, high level hemoglobin in kidney itself can also damage kidney. Read more...

Do you think that it's better for o+ people to consider a gluten free diet even if they don't have celiac disease? N.B I hv a potential Crohn's disease

It depends.. There are many food "intolerances" that are not clear "syndromes" and can be very individual. You may find you feel better off wheat even if you don't have celiac disease per se. So trial and error to sort it out personal intolerances is ok. But stop for a week, then rechallenge for a week for a few cycles. Be sure it is real or you may just have a sensitive stomach and end up a dietary cripple. Read more...
No relationship. Gluten free diet benefits only those who are truly sensitive to gluten you need to consult a GI doctor if you suspect you may have a gluten issue or crohn's disease. Your blood type has nothing to do with either. Read more...