The physiology of<unk>  and<unk>  encompass psychological states, the central nervous system, the autonomic nervous system, gastric dysrhythmias, and the endocrine system. Each individual has a threshold for<unk>  that changes minute by minute. Stimuli giving rise to<unk>  and<unk>  originate from visceral, vestibular, and chemoreceptor trigger zone inputs which are mediated by serotonin/dopamine, histamine/acetylcholine, and serotonin/dopamine, respectively.
Nausea and vomiting pathophysiology
Upper gastrointestinal bleeding pathophysiology
Steatorrhea risk factors
Gastritis risk factors
Lower gastrointestinal bleeding pathophysiology
Irritable bowel syndrome risk factors
Carcinoid syndrome pathophysiology
Dyspepsia risk factors