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 · Oct 22, 2026
Abnormal Liver Tests: What High ALT, AST, or Bilirubin Means
High liver enzymes on a blood test are common. Learn what ALT, AST, alkaline phosphatase, and bilirubin mean, common causes like fatty liver and hepatitis, and next steps.
Ken D. Nguyen, MD · Oct 22, 2026
Anal Fissures: Painful Bowel Movements and Bleeding
An anal fissure is a small tear that causes sharp pain and bleeding with bowel movements. Learn causes, home care, prescription treatments, and when procedures help.
Ken D. Nguyen, MD · Oct 22, 2026
Autoimmune Hepatitis, PBC, and PSC
Autoimmune hepatitis, primary biliary cholangitis (PBC), and primary sclerosing cholangitis (PSC) are immune-related liver diseases. Learn symptoms, diagnosis, and treatment.
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
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 · 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 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 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 24, 2026
Fatty Liver Disease (MASLD) and Liver Elastography (FibroScan)
What fatty liver disease (MASLD/MASH) is, how liver elastography (FibroScan) checks for fat and scarring, and today's treatments, including Rezdiffra and Wegovy.
Ken D. Nguyen, MD · Oct 23, 2026
Gallstones, Gallbladder Disease, and Pancreatitis
Gallstones can cause pain, bile duct blockage, and pancreatitis. Learn the symptoms, emergency warning signs, and treatments including ERCP and gallbladder surgery.
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 · Oct 24, 2026
Hepatitis B: Testing, Treatment, and Liver Cancer Screening
Hepatitis B is common in Asian American communities and often has no symptoms. Learn who should be tested, how it's treated, and why liver cancer screening matters.
Ken D. Nguyen, MD · Oct 24, 2026
Hepatitis C: A Curable Liver Infection
Hepatitis C can now be cured in 8 to 12 weeks with pills. Learn who should be tested, what treatment involves, and what to expect after cure.
Ken D. Nguyen, MD · Oct 22, 2026
Liver Cancer Screening: Who Needs It and How Often
People with cirrhosis or chronic hepatitis B have a higher risk of liver cancer. Learn who should be screened, the ultrasound and AFP schedule, and why early detection matters.
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
Pancreatic Cysts: What to Do When One Is Found
Pancreatic cysts are often found by chance on a CT or MRI. Most are harmless, but some need monitoring. Learn the types, follow-up tests, and when EUS is used.
Ken D. Nguyen, MD · Oct 23, 2026
Rectal Bleeding: Common Causes and When to See a Doctor
Blood in the stool or on toilet paper has many causes, from hemorrhoids to polyps. Learn common causes, emergency warning signs, and when you need a colonoscopy.
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 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.
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.
Ken D. Nguyen, MD · Nov 4, 2018
H. Pylori Infection
H. pylori infection is a form of infection that happens when a bacteria known as Helicobacter pylori infects the stomach. This usually occurs during childhood and is…
Ken D. Nguyen, MD · Nov 4, 2018
Irritable Bowel Syndrome (IBS)
Irritable bowel syndrome (IBS), also referred to as spastic colon, a disorder that affects the large intestine. This gastrointestinal disorder comes with both common…
Tim Chen, MD · Jun 21, 2018
Peptic Ulcer Disease
Peptic ulcer disease is a condition where ulcerations, or sores, form on the lining of the stomach or intestines, although ulcers can form anywhere along the…
Ken D. Nguyen, MD · Jun 20, 2018
Colorectal Cancer
Colorectal cancer, which is also referred to as large bowel cancer, rectal cancer or colon cancer, affects the colon and the rectum. A cancer is an abnormal growth…
Ken D. Nguyen, MD · Jun 17, 2018
Hemorrhoids
Hemorrhoids is a medical condition whereby the veins located in the anus and the lower rectum become swollen, causing discomfort, pain, and even bleeding.
Ken D. Nguyen, MD · Jun 17, 2018
Constipation
By definition, constipation if the difficult passage of stools that tends to be persistent for several weeks or even longer. Generally, someone with constipation may…
Ken D. Nguyen, MD · Jun 17, 2018
Cirrhosis
Cirrhosis is a condition whereby the liver is permanently scarred or injured by chronic conditions or diseases. The scar tissue that forms of the liver prevents…