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Gastroenterology is a branch of medicine that focuses on the structure, functions and diseases of your digestive tract. Symptoms and complaints related to the digestive tract are some of the most common reasons we take over-the-counter medications, prescription medication or seek the advice of health-care providers.

Gastroenterologists, or “GIs,” are medical specialists with extensive training in diseases of the digestive tract. GIs can answer your questions, perform tests in making a diagnosis and prescribe the best course of treatment to help you feel better.

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AGA GI Locator

Locate an AGA member gastroenterologist in your area.

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Patient Guides

The following guides will provide some basic facts to help you better understand your condition and to serve as a starting point for discussions with your doctor; provide some basic facts about how GIs treat and manage all aspects of the digestive tract, including nutritional needs and obesity, as well as complications from medications; and help you understand how GI procedures can benefit you and what you can expect before, during and after.


Preparing for a Capsule Endoscopy

A capsule the size of a large vitamin pill, is swallowed and travels through the gastrointestinal tract, sending multiple images a second to a recording device worn around your waist.

Preparing for a Colonoscopy

Colonoscopy refers to a medical procedure during which a long flexible tube is used to look inside the colon.

Upper GI Endoscopy

Upper GI endoscopy can be helpful in the evaluation or diagnosis of various problems, including difficult or painful swallowing, pain in the stomach or abdomen, and bleeding, ulcers and tumors.

What is CT Colonography?

CT colonography is a procedure for the screening of colorectal cancer using a CAT scan.

What is ERCP?

Endoscopic retrograde cholangiopancreatography may be useful in diagnosing and treating problems causing jaundice or pain in the abdomen.

Digestive Conditions

A Patient Guide: AGA Hepatitis B Virus Reactivation Guideline

This patient guide will help patients better understand whether they may be at risk of HBV reactivation.

A Patient Guide: Crohn’s Disease is an Immune Disorder

This patient guide will help patients with Crohn's disease better understand the treatment options that are available for them.

A Patient Guide: Managing Pancreatic Cysts

This patient guide will help patients better understand the best way to treat and monitor pancreatic cysts

A Patient Guide: Understanding Drugs to Treat IBS

This patient guide will help patients with IBS better understand the treatment options that are available for them.

A Patient Guide: Understanding Lynch Syndrome

Lynch syndrome is a mutation of a gene that is responsible for fixing errors in your DNA.

Colorectal Cancer Prevention and Treatment

More than one-third of colorectal cancer deaths could be avoided if all eligible individuals participated in regular screening.

Comparing Websites for Patients: Celiac Disease

Information on Celiac Sprue found on websites Celiac Sprue Association, eMedicineHealth, MedicineNet,, WebMD, Right Diagnosis, and Celiac Disease Foundation is reviewed.

Comparing Websites for Patients: Esophageal Disease

Information on esophageal disease found on WebMD, Wikipedia, HealthCentral, WrongDiagnosis, ACG, AGA and UpToDate is reviewed.

Comparing Websites for Patients: Hepatitis C

Hepatitis C information found on MedicineNet, Mayo Clinic, Hepatitis Central, Veterans Affairs Hepatitis C website, emedicinehealth, and UpToDate is reviewed.

Comparing Websites for Patients: IBD

Inflammatory Bowel Disease information on WebMD, eMedicineHealth, MedicineNet, CCFA, Foundation for Clinical Research in IBD, UpToDate, and Wikipedia is reviewed.

Comparing Websites for Patients: IBS

IBS information on the International Foundation for Functional Gastrointestinal Disorders, Mayo Clinic, WebMD, UpToDate, Healthline, MedicineNet, Wikipedia, and IBS Support Group is reviewed.

Educating Patients About Ulcerative Colitis Pocket Guide

A flipbook that discusses UC symptoms, complications, the importance of early intervention and treatment.

Heartburn & GERD

Heartburn is the most common symptom of a condition called gastroesophageal reflux disease (GERD), also known as acid reflux.


Each of us has veins around the anus that tend to stretch under pressure. When these veins swell and bulge, they are called “hemorrhoids” or “piles.”

IBD Self-Management

Vetted by AGA, here is expert advice from a trusted authority, Dr. Sunanda Kane, on all aspects of living with IBD.

Irritable Bowel Syndrome

IBS is a common disorder of the intestines that leads to crampy pain, gassiness, bloating and changes in bowel habits.

Living with Gas in the Digestive Tract

Although gas usually is not a sign of a medical problem, it can be. So if you have persistent or extreme gassiness (flatulence), mention it to your doctor when you have a checkup.

Master Your IBS

An eight-week plan proven to control the symptoms of irritable bowel syndrome.

Real Life with Celiac Disease

Troubleshooting and thriving gluten free.

Ulcerative Colitis — How Good Nutrition Can Help

An interactive resource guide that discusses UC symptoms, diagnosis and management, including the importance of nutrition.

Understanding Celiac Disease

Celiac disease is an autoimmune disorder that causes your immune system to interfere with the proper function of the small intestine.

Understanding Cirrhosis of the Liver

Cirrhosis occurs when the liver is permanently scarred or injured by chronic conditions and diseases.

Understanding Clostridium Difficile Infection and Its Treatments

Each year, Clostridium difficile bacterium infects roughly 500,000 people in the U.S., sending more than 347,000 to the hospital for treatment.

Understanding Constipation

Constipation is the infrequent and/or difficult passage of stool.

Understanding Gallstones

Gallstones are crystallized pieces of bile, which can range in size from microscopic to more than one inch.

Understanding Inflammatory Bowel Disease

The two major illnesses that are recognized most often as inflammatory bowel disease are ulcerative colitis and Crohn's disease.

Understanding Pancreatitis

Pancreatitis is inflammation of the pancreas that usually begins as a sudden attack and is often caused by gallstones or alcohol abuse.

Understanding Peptic Ulcer Disease

Peptic ulcer disease occurs when painful sores develop in the lining of the stomach or intestines.

Viral Hepatitis

Hepatitis is an inflammation of the liver. Currently there are at least five different viruses known to cause viral hepatitis.

Diet and Medication

Gut Check: Know Your Medicine

A campaign on the safe use of over-the-counter medicines.


What are probiotics, are they safe and should you take them?

The No-Diet Obesity Solution for Kids

Dr. Miriam Vos tells you how to change the habits that many families have slipped into and gives you specific ways to improve your child's health without diets, guilt trips or power struggles.

Understanding Food Allergies and Intolerances

It is important to work with your doctor if you think you have a food allergy or intolerance before omitting foods from your diet.

Understanding Obesity and Its Treatments

Many doctors and scientists feel that obesity is a disease because of the way it harms the body.

Using NSAIDs Wisely

Many people don’t know that NSAIDs can cause problems ranging from mild stomach upset and pain to serious stomach bleeding, ulcers and even death.


About Gastroenterology

Gastroenterology is a branch of medicine that focuses on the structure, functions and diseases of your digestive tract.

Acerca de gastroenterología

Gastroenterología es una rama de la medicina que se centra en la estructura, las funciones y las enfermedades del aparato digestivo.

From Our Partners


Learn more about your medical condition and explore your treatment options using UpToDate®, the same resource trusted by more than 600,000 clinicians around the world. After using UpToDate you will be more informed, so you can ask the right questions and have important conversations with your health-care provider.

Tummy Trends

Takeda developed Tummy Trends to provide IBS patients a discreet tool to track symptoms and behaviors in private and at their convenience. 

Shire UCentral

Shire UCentral is an educational website providing patients with ulcerative colitis (UC) access to resources and tools to help them manage their disease.