Gastroenterology and Hepatology

Olga Aroniadis, MD

Welcome from Our Chief

I am pleased to welcome you to the Division of Gastroenterology and Hepatology. Our highly trained physicians, with expertise in key gastroenterology (GI) areas, are available to you for evaluation, diagnosis and treatment. We are fortunate to be an integral part of Stony Brook Medicine, Long Island’s premier academic medical center, where we can draw on the resources of world-class physicians, healthcare staff, technology and state-of-the-art facilities.

Read More From Dr. Olga Aroniadis

What We Do

At Stony Brook Medicine's Division of Gastroenterology and Hepatology, we provide expert care for a wide range of digestive and liver conditions. From common issues like acid reflux, constipation and heartburn to precancerous conditions like Barrett’s esophagus, our team is here to help. We also offer routine screenings, such as colonoscopies, to support your ongoing digestive health.

As Long Island’s leading health center, we combine groundbreaking research with advanced technology to deliver top-notch care. Whether you're visiting us for a routine screening or a complex GI condition, our highly skilled physicians provide compassionate, respectful care tailored to your needs.

Why See a GI Specialist?

Digestive issues can affect your daily life and overall health. A GI specialist has the expertise to diagnose and treat conditions like acid reflux, irritable bowel syndrome (IBS) and liver diseases. Early detection and treatment can prevent complications and improve your quality of life. 

With advanced diagnostic tools and personalized care, GI specialists can uncover the root cause of your symptoms and tailor treatments to your unique needs. Whether you're dealing with chronic discomfort or new digestive concerns, seeking expert care can make all the difference.

A doctor in a white lab coat from Stony Brook Medicine consulting with a patient while holding an anatomical model of the large intestine.

About Gastroenterological Diseases

Gastroenterological diseases affect the digestive system, including the mouth, esophagus, stomach and intestines. Common conditions include GERD, ulcers and Crohn’s disease. These issues can cause symptoms like pain, bloating or changes in digestion. Our team is here to help you find relief and manage your condition effectively.

A female doctor in a white Stony Brook Medicine lab coat speaking with a seated patient in an examination room.

About Diseases of the Hepatobiliary System

The hepatobiliary system includes the liver, gallbladder and bile ducts. Diseases like hepatitis, gallstones and liver cirrhosis can impact your body’s ability to process nutrients and remove toxins. Our specialists use advanced techniques to diagnose and treat these conditions with care and precision.


For Patients: Procedure Instructions

Preparing for your procedure is an important step in ensuring the best results. Visit our procedure instructions page to view clear, easy-to-follow guidelines for your upcoming appointment.

Two medical professionals in blue surgical gowns and gloves discussing a procedure in a clinical setting, with one holding an endoscope instrument.

Find a Doctor Near You!

Our doctors practice out of locations all across Suffolk County. We have offices in Lake Grove, Commack, East Setauket and Stony Brook.

View all of our locations here

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