What causes ulcerative colitis and Crohns disease?
Despite a great deal of research, the cause of ulcerative colitis and Crohn’s disease is unknown. Some scientists believe IBD may be due to a defect in the body’s immune system (its natural protection against diseases), while others believe that bacteria or even viruses might play some role. However, there is no evidence that ulcerative colitis or Crohn’s disease is contagious. Relatives of people with IBD have a slightly greater risk of developing either disease. Stress or diet are not thought to cause IBD. Both diseases are more common in the Western world.
