These providers are the experts when it comes to care for gastrointestinal diseases and conditions such as abdominal pain, acid reflux (GERD), celiac disease, constipation, Crohn's disease, hemorrhoids, inflammatory bowel disease (IBD), irritable bowel syndrome (IBS), ulcerative colitis and more. Providing care under the names Advocate Health Care in Illinois; Atrium Health in the Carolinas, Georgia and Alabama; and Aurora Health Care in Wisconsin, Advocate Health is a national leader in clinical innovation, health outcomes, consumer experience and value-based care.