Gastroenterology is the diagnosis and treatment of disease affecting the gastrointestinal tract, which includes the esophagus, stomach, small intestine, colon and rectum. The liver, biliary system and pancreas are connected to the gastrointestinal tract.

Conditions treated

Barrett's esophagus Fructose intolerance
Bleeding of the digestive tract Gastroesophageal reflux disease (GERD)
Bloating, flatulence, gas Heartburn
C. Difficile infection Hemachromatosis
Celiac disease Heliobacter pylori infection
Cirrhosis of the liver Inflammatory bowel disease
Colitis Irritable bowel syndrome
Colon polyps Lactose intolerance
Constipation Liver diseases
Crohn's disease Pancreatitis
Diarrhea Peptic ulcers

Symptoms of gastrointestinal problems

Symptoms vary depending on the affected area of the gastrointestinal tract. General symptoms that can indicate a problems include:
Abdominal pain Neausea
Constipation Pencil-shaped bowel movements
Diarrhea Rectal bleeding
Digestive problems Swallowing problems


Gastroenterologists order and perform many types of diagnostic procedures. The most-common are colonscopy and EGD.

Colonoscopy allows the gastroenterologist to look inside the entire large intestine, which includes the rectum and colon. It uses an instrument called a colonoscope, which has a camera attached to the end of a long, flexible tube that is the width of an index finger. The physician views images from the scope on a monitor. The walls of the large intestine are thoroughly inspected for abnormalities such as inflamed or bleeding tissue, and polyps. Small samples of tissue are taken for examination. If a polyp is found, it will be removed and checked for cancer cells.

EGD is short for esophagogastroduodenoscopy. It is a test in which the gastroenterologist thoroughly inspects the inside of the upper digestive tract using a flexible instrument called an endoscope that is about the diameter of an index finger. A camera at the tip of the endoscope allows the physician to see the esophagus, stomach and first part of the small intestine to determine the cause of symptoms to explain the results of X-rays or other diagnostic tests.

Facts about colorectal cancer

  • More than 90 percent of colorectal cancer cases occur in people 50 and older.
  • Iowa and Illinois are among the top 25 percent of states and the District of Columbia with the highest incidence of colorectal cancer.
  • Black people have the highest rates of getting and dying of colorectal cancer, followed by white, Hispanic, Asian/Pacific Islander and American Indian/Alaska Native people.
  • Screening tests are important because colorectal cancer usually has no symptoms in the earliest – and most treatable – stages.
  • About62 to 70 percent of Iowans have colorectal screenings as recommended.

Lifestyle risk factors for colorectal cancer

  • Being overweight or obese
  • Drinking too much alcohol
  • Eating a low-fiber, high-fat diet
  • Eating few fruits and vegetables
  • Not exercising or being physically active
  • Using tobacco

Medical staff

Daniel Peasley, D.O. Paula Stultz, ARNP


Call 319-768-1520 to make an appointment. Physician referral is not required to become a Great River Gastroenterology patient, although many of our patients are referred by their primary-care providers.
Bring these to your first appointment:
  • Insurance cards, including primary, secondary and prescription insurance
  • List of medicines you are taking including prescriptions, over-the-counter medicines, vitamins, herbal remedies and other supplements
  • List of your medicine allergies, if any
  • Medical history
  • Photo ID
  • Prescription cards
Please give us 24 hours' notice if you need to change your appointment.


8 a.m. to 5 p.m. Monday through Friday
After hours, call 319-768-1520 and press 1 to reach the clinic's answering service. An operator will help you talk to a health care provider if needed. If you are having a health emergency, call 911. You may leave nonemergency messages, which will be answered on the next working day.

Prescription refills

Please request prescription refills two weeks before your last dose because many prescriptions require approval from insurance companies.
Suite 205, Eastman Plaza
1223 S. Gear Ave.
West Burlington, IA  52655