IBS & Digestive Disorders Treatment in NYC
Gastrointestinal disorders encompass a wide range of conditions, from autoimmune issues like Crohn's disease and ulcerative colitis to food allergies and sensitivities, including celiac disease and gluten sensitivity.
Living around your gut instead of your life?
- You map out bathrooms before you leave the house
- Your symptoms change from week to week
- You’ve had tests that came back “clear” and no plan
You’re not alone. Many of Dr. Kellman’s patients arrive after years of unexplained symptoms and being told their labs look normal. His job is to keep looking.
One system, many diagnoses
Patients frequently arrive carrying several GI labels at once — reflux, IBS, colitis, food intolerance — each managed separately by a different specialist.
What connects them is the state of the gut ecosystem: microbial balance, barrier integrity, digestive capacity, and the immune tissue that surrounds the intestine.
The Kellman approach
Dr. Kellman approaches nearly every condition through a microbiome-first lens. For GI disease that means testing the ecosystem itself rather than treating each symptom in isolation.
Treatment restores microbial balance and barrier function, identifies the specific triggers driving immune reactivity, and rebuilds digestive capacity — often resolving symptoms that had been managed for years.
Digestive conditions Dr. Kellman commonly sees
- Irritable bowel syndrome (IBS), including constipation-, diarrhea- and mixed-type
- SIBO and intestinal methanogen overgrowth
- Chronic bloating and excessive gas and burping
- Chronic constipation
- Reflux and indigestion
- Food intolerances, celiac disease and gluten sensitivity
- Leaky gut (intestinal permeability)
- Support for Crohn's disease and ulcerative colitis, alongside your gastroenterologist
What is IBS?
Irritable bowel syndrome causes recurring abdominal pain along with changes in bowel habits, such as constipation, diarrhea or both, without visible damage to the intestine. Bloating and gas are common. Symptoms often flare with stress or certain foods.
IBS overlaps with other conditions. A meaningful share of people with IBS symptoms have SIBO, and the gut-brain connection plays a large role, which is why a broader evaluation can help.
How Dr. Kellman evaluates digestive symptoms
Evaluation starts with your history, diet, bowel pattern and past treatments. Testing may include comprehensive stool and microbiome analysis, SIBO breath testing, celiac screening, food reactivity, inflammatory markers and thyroid testing. Referral for endoscopy or colonoscopy is recommended when your age or symptoms call for it.
When to see a doctor promptly
Seek prompt medical care for blood in the stool, black stools, unexplained weight loss, persistent vomiting, difficulty swallowing, fever, or severe or worsening abdominal pain.
Common questions
I already have a GI specialist. How is this different?
Conventional gastroenterology is excellent at structural diagnosis and acute management. Dr. Kellman's work addresses the microbiome and immune drivers underneath the diagnosis, and runs alongside that care rather than replacing it.
What testing is involved?
Microbiome analysis, assessment of intestinal permeability and digestive function, food reactivity and inflammatory markers, and screening for overgrowth such as SIBO. The findings determine the protocol.
Is IBS the same as SIBO?
No, but they overlap. IBS describes a pattern of symptoms, while SIBO is an overgrowth of bacteria in the small intestine that can cause many of the same symptoms. Testing for SIBO is often worthwhile in people with IBS.
Can stress cause IBS?
Stress doesn't cause IBS on its own, but the gut and brain are closely connected, and stress commonly makes IBS symptoms worse.
Treat the ecosystem, not each symptom.
Book a Consultation“With Dr. Kellman’s guidance I treated SIBO overgrowth and my inflammation and it completely changed my life.”
Google review · Sep 2025
“Dr. Kellman has helped me so much in the last few years. Staff is super friendly and helpful. Would definitely recommend if you have gut issues or thyroid problems.”
Google review · Dec 2023
“Think I finally found a Doctor who looks at why and doesn’t just prescribe”
Google review · Sep 2024
Reviews are shared exactly as written by patients on Google. Individual experiences vary.