Treatment of gastrointestinal diseases at Mayo Clinic in Arizona involves several subspecialty clinics, which combine clinical expertise and research.

Physicians in Gastroenterology and Hepatology see patients with diseases or disorders of the pancreas, liver, gallbladder, esophagus, stomach, small intestine and colon. Diseases, treatments and procedures include:

A
Achalasia
AIDS-related diarrheal illnesses
Alcoholic liver disease
Alpha 1-antitrypsin deficiency
Anal cancer
Anal manometry
Autoimmune cholangitis
Autoimmune chronic active hepatitis

B
Barrett's esophagus
Benign and malignant liver tumors
Bernstein study
Bile duct stones
Bile duct strictures
Biliary atresia
Bleeding from peptic ulcers
Budd-Chiari syndrome

C
Capsule endoscopy
Cancer of appendix
Cancer of the esophagus
Cancers of the colon or rectum
Cancer of the stomach
Carcinoid tumors
Caroli's disease
Cavernous hemangioma
Cholangiocarcinoma
Crohn's disease (see Inflammatory Bowel Disease)
Chronic gastrointestinal bleeding of unknown cause
Collagenous/Microscopic colitis
Cirrhosis
Colonic diverticular disease / Diverticulitis
Colonoscopy
Constipation

D
Diaphragmatic hernia
Diffuse esophageal spasm
Disorders of malabsorption (celiac sprue, Whipple's disease, lymphangiectasia)
Diverticulitis
Diaphragmatic hernia
Drug-induced hepatotoxicity

E
Endocrine tumors
Endoscopic ultrasound (EUS)
Endoscopic retrograde cholangiopancretography (ERCP)
Eosinophilic gastroenteritis
Esophageal cancer
Esophageal disease/Motility clinic
Esophageal motility (manometry)
Esophageal varices
Esophagectomy

F
Familial adenomatous polyposis (FAP)
Familial amyloidosis
Fecal incontinence
Flexible sigmoidoscopy
Functional bowel disorders (FBD)

G
Gallbladder disease
Gallstones
Gastroesophageal reflux disease or GERD
Gastrointestinal bleeding of unknown cause
Gastrointestinal hemorrhage (subacute or chronic)
Gastroparesis

H
Helicobacter-pylori (H-Pylori) breath test
Hemochromatosis
Hepatitis
Hepatocellular carcinoma
Hereditary nonpolyposis colorectal cancer (HNPCC or Lynch syndrome)
Hydrogen breath test

I
Idiopathic portal hypertension
Infectious colitis or infectious enteritis
Inflammatory bowel disease
Iron deficiency anemia
Irritable bowel syndrome

L
Liver cancer
Liver disease
Liver transplant
Liver tumors
Lymphoma of colon or rectum

N
Neuroendocrine tumors
Nonalcoholic fatty liver disease

P
Pancreatic cancer
Pancreatic cystic neoplasm
Pancreatic intraductal papillary mucinous tumor
Pancreatic pseudocysts
Pancreatitis, acute
Pancreatitis, chronic
Pancreas divisum
Paracentesis
Pelvic floor dysfunction
Peptic ulcer disease and other manifestations of Helicobacter pylori infection
Percutaneous gastroscopy (PEG)
Polyps of the colon or rectum
Pouchitis
Primary biliary cirrhosis
Primary hyperoxyluria
Primary sclerosing cholangitis
Pseudo-obstruction
Push enteroscopy

R
Radiation colopathy
Radiation enteropathy
Radiation proctopathy

S
Small bowel motility
Sphincter of Oddi dysfunction

T
Tensilon study
24HR PH monitor

U
Ulcerative colitis
Upper endoscopy (EGD)
Upper endoscopy with dilatation (EGDiL)

V
Veno-occlusive disease
Viral hepatitis B and C

W
Wilson's disease