Ken D. Nguyen, MD · Oct 22, 2026
24-Hour pH Testing: Measuring Acid Reflux
Esophageal pH testing measures how often acid reflux happens and whether it matches your symptoms. Used for heartburn that doesn't respond to medicine and before reflux surgery.
Ken D. Nguyen, MD · Oct 23, 2026
Barrett's Esophagus: Who Should Be Checked and How It's Treated
Barrett's esophagus is a change in the esophagus lining caused by long-term acid reflux. Learn who should be screened, how it's found, and treatment options.
Ken D. Nguyen, MD · Oct 23, 2026
Trouble Swallowing (Dysphagia): Causes, Tests, and Treatment
Trouble swallowing (dysphagia) is never normal. Learn common causes, when it's an emergency, and how a GI evaluates and treats it with endoscopy and manometry.
Ken D. Nguyen, MD · Oct 23, 2026
Eosinophilic Esophagitis (EoE): Trouble Swallowing and Food Getting Stuck
Eosinophilic esophagitis (EoE) is an allergic inflammation of the esophagus that causes trouble swallowing and food getting stuck. Learn diagnosis and treatment options.
Ken D. Nguyen, MD · Oct 22, 2026
Esophageal Manometry: Testing How Your Esophagus Works
Esophageal manometry measures the pressure and coordination of the esophagus muscles. Used for trouble swallowing, achalasia, chest pain, and before reflux surgery.
Ken D. Nguyen, MD · Oct 22, 2026
Esophageal Motility Disorders and Achalasia
When the esophagus muscles don't squeeze normally, food can stick or come back up. Learn about achalasia, esophageal spasm, testing with manometry, and treatment.
Ken D. Nguyen, MD · Oct 22, 2026
Gastritis: Causes, Symptoms, and Treatment
Gastritis is inflammation of the stomach lining. Learn the common causes, including H. pylori and NSAIDs, symptoms, how it's diagnosed, and treatment.
Ken D. Nguyen, MD · Oct 22, 2026
Gastroparesis: When the Stomach Empties Too Slowly
Gastroparesis causes nausea, vomiting, and early fullness because the stomach empties too slowly. Learn causes, testing, diet changes, and treatments.
Ken D. Nguyen, MD · Oct 24, 2026
GERD and Acid Reflux: Causes, Treatment, and When to See a GI
Frequent heartburn may be GERD. Learn the causes, lifestyle changes and medicines that help, warning signs, and when an upper endoscopy is needed.
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
H. Pylori Infection: Symptoms, Testing, and Treatment
H. pylori is a common stomach infection that causes ulcers and raises stomach cancer risk, especially in Asian Americans. Learn testing, current treatment regimens, and how to confirm a cure.
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.
Tim (Tien-Chun) Chen, MD · Jun 21, 2018
Peptic Ulcer Disease: Causes, Symptoms, and Treatment
Peptic ulcers are sores in the stomach or duodenum, most often caused by H. pylori or NSAIDs. Learn the warning signs of bleeding, how ulcers are diagnosed, and treatment options.
Ken D. Nguyen, MD · Oct 23, 2026
Stomach Cancer Risk and Screening in Asian Americans
Asian Americans have a higher risk of stomach cancer. Learn the risk factors, the role of H. pylori, warning signs, and when to talk with a GI about screening endoscopy.
Tim (Tien-Chun) Chen, MD · Oct 24, 2026
亞裔美國人的胃癌風險與篩檢
華人等亞裔族群罹患胃癌的風險較高。了解風險因素、幽門螺旋桿菌的影響、警訊症狀，以及何時應考慮胃鏡篩檢。
Ken D. Nguyen, MD · Oct 24, 2026
Nguy Cơ và Tầm Soát Ung Thư Dạ Dày ở Người Mỹ Gốc Á
Người gốc Á, trong đó có người Việt, có nguy cơ ung thư dạ dày cao hơn. Tìm hiểu các yếu tố nguy cơ, vai trò của vi khuẩn H. pylori, dấu hiệu cảnh báo và khi nào nên nội soi.
Ken D. Nguyen, MD · Jun 17, 2018
Upper GI Endoscopy (EGD): Why It's Done and What to Expect
Upper endoscopy (EGD) examines the esophagus, stomach, and duodenum to diagnose and treat reflux, ulcers, bleeding, and swallowing problems and to screen for stomach cancer. Learn how to prepare.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.