Princeton Gastroenterology Associates
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About Princeton Gastroenterology Associates

Princeton Gastroenterology Associates is a premier gastroenterology group with five physicians, working alongside our staff to offer our patients the highest care possible.

Princeton Gastroenterology Associates is a regional leader in the treatment of gastrointestinal and liver disorders, serving the Central New Jersey region since 1990. The five board certified physicians, together with a large clinical and administrative support staff comprise our group. With an office and a state of the art endoscopy center in Princeton Junction, PGA provides the highest quality of care available in digestive disease diagnosis, evaluation and management.

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Celiac Disease

Celiac disease is an autoimmune disease where a patient’s immune system abnormally responds to the ingestion of gluten. It is estimated that 1 in 100 people worldwide is affected by celiac disease. However, up to 2.5 million people in the United States may have celiac disease and not know it, as the symptoms range from mild to severe.

Constipation

Constipation is defined as having a bowel movement fewer than three times per week. With constipation, stools are usually hard, dry, small in size, and difficult to eliminate. Some people who are constipated find it painful to have a bowel movement and often experience straining, bloating, and the sensation of a full bowel.

GERD

Gastroesophageal reflux disease (GERD) is a more serious form of gastroesophageal reflux (GER) which is common. GER occurs when the lower esophageal sphincter (LES) opens spontaneously, for varying periods of time, or does not close properly, and stomach contents rise up into the esophagus.

Hemorrhoids

Hemorrhoids are swollen veins in the anal canal. This common problem can be painful and can be caused by too much pressure on the veins in the pelvic rectal area. Normally, tissue inside the anus fills with blood to help control bowel movements, but if you strain or sit on the toilet a long time to move stool, the increased pressure causes the veins in this tissue to swell and stretch.

Inflammatory Bowel Disease + Crohn's Disease & Ulcerative Colitis

Inflammatory bowel disease (IBD) encompasses a set of gastrointestinal diseases where parts of the digestive tract are chronically inflamed by a dysfunctional interaction immune system. Hereditary factors and an abnormal interaction between microorganisms and the immune system are felt to play a role.

Irritable Bowel Syndrome

It is estimated that 10 to 15 percent of Americans have Irritable Bowel Syndrome (IBS). IBS is a functional GI disorder that refers to a group of symptoms that affect the digestive tract, often resulting in abdominal pain, bloating, or cramping. However, some people with IBS have no symptoms at all.

What Our Patients Say About Us

Dr. Andrade took care of my situation seamlessly, he was very knowledgeable about my condition and offered insight on what to do about my condition. His colonoscopy practice was pain-free and I didn't have issues after the procedure. His staff is very friendly and will take good care of you.
Yurani F.
Patient Testimonial Image
Dr Bellows is very patient and knowledgeable. He will patiently listen to your problems unlike other doctors that are just rushing through the 3 minutes they came see you in the exam room. He will explain the procedure without being judge mental. 100000/10 bedside manners.
Nayab A.
Nayab A.
Dr. Shriver was very nice and listened to everything I said, she explained the next steps in great detail and made sure she answered any questions I had. The nursing staff was courteous and attentive. I would highly recommend Dr. Shriver.
Melanie R.
Melanie R.
I strongly recommend Dr Osias. Very professional and caring, and takes time to answer questions. His nurse Lisa is very helpful too in explaining procedures and cautions related to the treatment.
Weier L.
Patient Testimonials
Great practice. Staff at check in helpful and kind. Dr. Rho was very compassionate to some concerns I have about tests needed. He spent as much time as I needed to understand my condition. Check out was efficient and everyone was compassionate and helpful. I am in healthcare and I hope my clients feel as cared for as I did during my visit. I also witnessed staff assisting elderly patient with directions for upcoming appointment.
Tammy H.
Tammy H.
I have been a patient for many years and I alway receive the best medical care. The staff is friendly and extremely helpful. Dr. Meirowitz takes his time and explains any procedures thoroughly. His skill as a endoscopist is exceptional. I would highly recommend Dr. R. Meirowitz for all your GI related issues.
PR
Patient Testimonials
Dr. Andrade and his staff made my visit a stress-free experience. He spoke with me before and after the procedure and answered all my questions in a clear and caring manner. They are an experienced and organized team who made me feel very comfortable and I would highly recommend him to anyone looking for a GI doctor.
Laura K.
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Dr. Bellows listened patiently while I explained my entire medical history and he took the time to address all of my questions and concerns before creating a plan of treatment for me. I was very concerned that I would be pushed into taking PPI's or some other medication for my GI issues, but Dr. Bellows did not pressure me in that direction.
Dawn H.
Patient Testimonials
I was seen right away. Dr. Shriver was able to quickly diagnose my issue with the minimum of discomfort possible, and recommend treatment. I am very happy with her manner, the manner of the nurse assisting her, and my overall experience.
Nathan L.
Patient Testimonials
Dr. Osias and staff (at both his office and the surgical center--Carol, Maureen, Dr. Hirsh to name a few) are professional, friendly, and made me feel very at ease. Was recommended to Dr. Osias by someone in my office and have already recommended him to someone else in my office.
Jill
Patient Testimonials
Dr. Aloysius Rho is the best of the best. He is extremely knowledgeable and caring. He took his valuable time to explain the details when I didn’t understand. After the exam and tests, he even called to inform me the next steps I should follow. He wanted to make sure I was okay. It's so rare to find a doctor that is brilliant, highly skilled and dedicated. I would give him 10 stars if I could. Dr. Rho is a true professional and I would recommend him to anyone. The staff in his office is also very friendly and helpful.
Yinfu S.
Patient Testimonials
Dr. Meirowitz is the consummate professional - he has been my gastroenterologist for over 20 years and he provides excellent care.
DH
Patient Testimonials

Blogs
IBS

How to Relieve IBS Pain

The abdominal pain and cramping of irritable bowel syndrome (IBS) can range from a nagging ache to a flare that stops you in your tracks. If you are searching for

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August 8, 2026
Bloating

How to Stop Bloating After Meals

That tight, swollen, uncomfortable feeling that shows up after eating is one of the most common digestive complaints, and it can turn an enjoyable meal into hours of discomfort. The

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August 1, 2026
Diet

How to Follow an Elimination Diet for IBS

For people living with irritable bowel syndrome (IBS), food can feel like a minefield, with meals sometimes triggering abdominal pain, bloating, and unpredictable bowel habits. A structured elimination diet is

Read More »
July 22, 2026

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