* The slowing of the body's basal metabolic rate associated with hypothyroidism *Pernicious anemia where there is antibody production against parietal cells which normally produce gastric acid. * The use of antacids or drugs that decrease gastric acid production (such as H2-receptor antagonists) or transport (such as proton pump inhibitors). * A symptom of rare diseases such as mucolipidosis (type IV). * A symptom of Helicobacter pylori infection which neutralizes and decreases secretion of gastric acid to aid its survival in the stomach. * A symptom of atrophic gastritis or of stomach cancer. * Radiation therapy involving the stomach. * Gastric bypass procedures such as a duodenal switch and RNY, where the largest acid producing parts of the stomach are either removed, or blinded. * VIPomas (vasoactive intestinal peptides) and somatostatinomas are both islet cell tumors of the pancreas. * Pellagra, caused by niacin deficiency. * Chloride, sodium, potassium, zinc and/or iodine deficiency, as these elements are needed to produce adequate levels of stomach acid (HCl). * Sjögren's syndrome, an autoimmune disorder that destroys many of the body's moisture-producing enzymes * Ménétrier's disease, characterized by hyperplasia of mucous cells in the stomach also causing excess protein loss, leading to hypoalbuminemia. Presents with abdominal pain and edema
Achlorhydria
Hyperchlorhydria
Steatorrhea
Pseudodiarrhea
Aphagia
Polydipsia
Drooling
Constipation