(815) 397-7340

Matthew Stier, MD

Dr. Matthew W. Stier is a board certified gastroenterologist and joined Rockford Gastroenterology Associates, Ltd. in 2019. He completed his undergraduate studies in pharmaceutical science at Purdue University and graduated with honors from the University of Illinois College of Medicine at Chicago. Dr. Stier went on to complete his residency in Internal Medicine and fellowship in Gastroenterology, Hepatology & Nutrition at the University of Chicago, where he also served as chief fellow from 2017-2018.

During fellowship training Dr. Stier participated in clinical research on the endoscopic management of Barrett’s esophagus and advanced polypectomy techniques, which he presented at regional and national scientific meetings. He has authored numerous peer-reviewed publications and continues to be committed to advancing the care of all patients. Dr. Stier is a member of the American Gastroenterological Association, the American College of Gastroenterology, the American Association for the Study of Liver Diseases, and the American Society for Gastrointestinal Endoscopy.

Dr. Stier is also board certified in Internal Medicine. He is an active member of the medical staff at UW Health Rockford Hospital and OSF St. Anthony Medical Center.

Although Dr. Stier is well trained in the broad disciplines of gastroenterology, hepatology and clinical nutrition, he has special interests in Barrett’s esophagus, improving quality in colorectal cancer screening, liver disease including hepatitis C, and the management of inflammatory bowel disease.

Conditions Dr. Stier 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
  • Crohn’s Disease
  • Diarrhea
  • Dyspepsia
  • Esophageal Disorders including Dysphagia (trouble swallowing)
  • Fecal Incontinence & Urgency
  • Fatty Liver (NAFLD/NASH)
  • Gallstones & Gallbladder Disease
  • Hemorrhoids
  • Hiatal Hernia
  • Helicobacter Pylori Infection
  • Irritable Bowel Syndrome (IBS)
  • Inflammatory Bowel Disease (Crohn’s Disease or Ulcerative Colitis)
  • Pancreatitis (Acute & Chronic)
  • Pancreatic Cysts & Mass
  • Peptic Ulcer Disease (Stomach Ulcers)
  • Radiation Proctitis
  • Rectal bleeding
  • Small Intestinal Bacterial Overgrowth (SIBO)
  • Ulcerative Colitis

Procedures Dr. Stier performs:

  • Upper Endoscopy (EGD)
  • Colonoscopy
  • Flexible Sigmoidoscopy
  • Ambulatory pH Monitoring (Bravo© pH)
  • Argon Plasma Coagulation (APC)
  • Endoscopy for Gastrointestinal Bleeding
  • Fecal Microbiota Transplant (FMT) for Chronic C. Difficile Infection
  • PEG Tube Placement (Endoscopic Feeding Tube)
  • Radiofrequency Ablation (RFA) for Barrett’s Esophagus
  • Video Capsule Endoscopy (VCE) of the Small Intestine
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