<unk>  in the early stages will have signs and symptoms of indigestion or similar to irritable bowel disease (IBD) such as: * Hypergastrinemia * Ulcers of the duodenum, stomach, and small intestine. * Severe diarrhea. * Generalized cancer symptoms. * Pain and Bleeding in stool. * Obstruction of intestine. * Weight loss/ poor appetite * Anemia (Due to Vitamin B12 malabsorption, and bleeding) * Hematemesis * Gastroesophageal reflux disease * Esophageal complications (Barrett's esophagus, esophagitis, stricture formation) * Vomiting * Steatorrhea * Depression
Gastrinoma
Glomus tumor
Somatostatinoma
VIPoma
Glucagonoma
Ceruminous adenoma
Insulinoma
Nipple adenoma