Ken D. Nguyen, MD · Oct 22, 2026
Abdominal Pain and Bloating: When to See a GI Doctor
Belly pain and bloating have many causes, from IBS to gallstones. Learn common causes by location, red-flag symptoms, and how a gastroenterologist evaluates them.
Ken D. Nguyen, MD · Nov 18, 2023
Capsule Endoscopy (NaviCam Small Bowel with AI ProScan)
Capsule endoscopy uses a swallowed camera to examine the small intestine. We use the NaviCam Small Bowel capsule with AI-assisted ProScan reading. Learn why it's done, how to prepare, and what to expect.
Ken D. Nguyen, MD · Oct 23, 2026
Celiac Disease: Symptoms, Testing, and the Gluten-Free Diet
Celiac disease is an immune reaction to gluten that damages the small intestine. Learn the symptoms, how to get tested correctly, and how it's managed.
Ken D. Nguyen, MD · Oct 22, 2026
Chronic Diarrhea: Causes and When to See a Gastroenterologist
Diarrhea lasting more than 4 weeks needs a closer look. Learn common causes, warning signs, tests, and treatments for chronic diarrhea.
Ken D. Nguyen, MD · Oct 23, 2026
Colon Polyps and Colon Cancer Screening: Start at 45
Colon cancer screening is recommended starting at age 45. Learn about colon polyps, screening options like colonoscopy and stool tests, and how often to be screened.
Ken D. Nguyen, MD · Jun 20, 2018
Colonoscopy: What to Expect, Prep, and Recovery
Colonoscopy is the best test to find and prevent colon cancer. Learn why it is done, how to prepare, what to expect, and recovery. Screening starts at 45. Temple City and Arcadia.
Ken D. Nguyen, MD · Jun 20, 2018
Colorectal Cancer: Symptoms, Screening, and Treatment Options
Colorectal cancer is common and rising in younger adults, but screening can prevent it. Learn the symptoms, risk factors, when to start screening, and treatment options.
Ken D. Nguyen, MD · Jun 17, 2018
Constipation: Causes, Relief, and Treatment Options
Constipation causes hard, infrequent stools and straining. Learn the causes, when to see a gastroenterologist, and treatments from fiber and laxatives to prescription medicines and biofeedback.
Ken D. Nguyen, MD · Oct 24, 2026
Crohn's Disease: Symptoms, Treatment, and Clinical Trials
Crohn's disease can affect any part of the digestive tract. Learn the symptoms, how it's diagnosed, current treatments, and our clinical trials now enrolling.
Ken D. Nguyen, MD · Oct 23, 2026
Diverticulosis and Diverticulitis: Symptoms, Treatment, and Prevention
Diverticulosis is common with age; diverticulitis is when the pouches become inflamed. Learn the symptoms, when to seek care, treatment, and prevention.
Ken D. Nguyen, MD · Oct 22, 2026
Flexible Sigmoidoscopy: What to Expect
Flexible sigmoidoscopy examines the rectum and lower colon with a simpler prep than colonoscopy, usually a Fleet enema. Why it's done, how to prepare, and recovery.
Ken D. Nguyen, MD · Oct 22, 2026
GI Bleeding and Iron-Deficiency Anemia
Black stools, blood in the stool, or unexplained iron-deficiency anemia can mean bleeding in the digestive tract. Learn the causes, warning signs, and tests.
Ken D. Nguyen, MD · Nov 4, 2018
Irritable Bowel Syndrome (IBS): Symptoms, Diagnosis, and Treatment Options
IBS causes belly pain with diarrhea, constipation, or both. Learn how it is diagnosed, the low-FODMAP diet, and treatment options for IBS-D and IBS-C, from peppermint oil to prescription medicines.
Ken D. Nguyen, MD · Oct 25, 2026
Lactulose Breath Test for SIBO and Sugar Intolerance
A lactulose breath test checks for SIBO at home with the FoodMarble MedAIRE. The same device tests lactose, fructose, sorbitol, inulin, and sucrose intolerance.
Ken D. Nguyen, MD · Oct 22, 2026
Microscopic Colitis: A Hidden Cause of Watery Diarrhea
Microscopic colitis causes chronic watery diarrhea, often in older adults, and can only be diagnosed with biopsies. Learn causes, diagnosis, and treatment.
Ken D. Nguyen, MD · Oct 22, 2026
Motility Capsule Test: Measuring How Your Gut Moves
The motility capsule test measures how fast food moves through the stomach, small intestine, and colon. Used for gastroparesis and severe constipation. Prep and what to expect.
Ken D. Nguyen, MD · Oct 22, 2026
SIBO (Small Intestinal Bacterial Overgrowth)
SIBO happens when too many bacteria grow in the small intestine, causing bloating, gas, and diarrhea. Learn risk factors, breath testing, and treatment.
Ken D. Nguyen, MD · Oct 22, 2026
Small Bowel Enteroscopy: Looking Deeper Into the Small Intestine
Enteroscopy uses a longer endoscope to examine and treat the small intestine, often for bleeding or anemia found on capsule endoscopy. How to prepare and what to expect.
Ken D. Nguyen, MD · Oct 24, 2026
Ulcerative Colitis: Symptoms, Treatment, and Clinical Trials
Ulcerative colitis causes inflammation of the colon. Learn the symptoms, how it's diagnosed, today's treatments, and our clinical trials now enrolling.PPO & Medicare welcome
Our board-certified gastroenterologists are in network with most PPO plans, including Aetna, Anthem Blue Cross, Blue Shield of California, Cigna, and UnitedHealthcare, plus Medicare. Most PPO plans need no referral, and healthy adults 45 and older can often schedule a screening colonoscopy without an office visit.