Hello, Colonoscopy is the most accurate method of diagnosing Crohn s disease. Since the surgeon has diagnosed you with Crohn s after doing a biopsy he is most likely correct. You have said that you have started experiencing bloating and constipation after stopping sulfasalazine it further confirms your diagnosis. I would advise you to consult with another surgeon and take a second opinion about your case. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Nazma Amman