(815) 397-7340

Aaron Shiels, MD

Dr. Aaron Shiels joined Rockford Gastroenterology Associates in 2004, and currently serves as Managing Partner. He is a board-certified Gastroenterologist. Dr. Shiels received his medical degree from Washington University School of Medicine in St. Louis where he also completed his Internal Medicine Residency and Gastroenterology Fellowship. As a Gastroenterology Fellow, Dr. Shiels received specialized training in diseases of the liver, pancreas, and biliary tract, including diagnostic and therapeutic ERCP. He participated in research projects studying biliary complications after liver transplant surgery and complications following bariatric surgery for morbid obesity.

Dr. Shiels is a Clinical Associate Professor of Medicine at the University of Illinois College of Medicine at Rockford. He remains active in medical student teaching in the classroom and the clinical setting. He has active research projects on colon cancer with medical students from Rockford. He has received numerous teaching awards, including the Golden Apple.

Dr. Shiels advocates for our GI patients on a national level, having served on the American Society of Gastrointestinal Endoscopy Health and Public Policy Committee and the Reimbursement Committee. He has participated in visits to senator and representative offices on Capitol Hill. He is a member of the American Society of Gastrointestinal Endoscopy, American Gastroenterological Association, American College of Gastroenterology, Illinois State Medical Society, and Winnebago County Medical Society.

Dr. Shiels maintains an interest in pancreatic disease, biliary disease, and liver disease including treatment of hepatitis C and has presented on hepatitis C at local and regional meetings. His hobbies include golf, running, and spending time with his family.

Add Dr. Shiels is an active member of the medical staff at UW Health Swedish American Hospital and OSF Saint Anthony Medical Center.

Conditions Dr. Shiels treats:

  • Abnormal Liver Tests
  • Anemia
  • Acid Reflux/Heartburn/GERD
  • Barrett’s Esophagus
  • Biliary Tract Disorders
  • Celiac Disease
  • Chronic Liver Disease, including Cirrhosis
  • Colon Cancer Prevention
  • Colon Polyps
  • Constipation
  • Clostridium Difficile Infection
  • Diarrhea
  • Esophageal Disorders including Dysphagia (trouble swallowing)
  • Fecal Incontinence & Urgency
  • Fatty Liver (NAFLD/NASH)
  • Gallstones & Gallbladder Disease
  • Hepatitis B & Hepatitis C
  • Hemorrhoids
  • Hiatal Hernia
  • Helicobacter Pylori Infection
  • Irritable Bowel Syndrome (IBS)
  • Pancreatitis (Acute & Chronic)
  • Pancreatic Cysts & Mass
  • Peptic Ulcer Disease (Stomach Ulcers)
  • Radiation Proctitis
  • Rectal bleeding
  • Small Intestinal Bacterial Overgrowth (SIBO)
  • Ulcerative Colitis

Procedures Dr. Shiels performs:

  • Upper Endoscopy (EGD)
  • Colonoscopy
  • Flexible Sigmoidoscopy
  • Endoscopic Retrograde Cholangiopancreatography (ERCP)
  • Endoscopy for Gastrointestinal Bleeding
  • Ambulatory pH Monitoring (Bravo© pH)
  • Argon Plasma Coagulation (APC)
  • Fecal Microbiota Transplant (FMT) for Chronic C. Difficile Infection
  • PEG Tube Placement (Endoscopic Feeding Tube)
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