Assessment of nausea and vomiting, adults

Nausea and vomiting are extremely common symptoms and may be caused by a vast array of medical conditions.​​[1]Quigley EM, Hasler WL, Parkman HP. AGA technical review on nausea and vomiting. Gastroenterology. 2001 Jan;120(1):263-86. https://www.doi.org/10.1053/gast.2001.20516 http://www.ncbi.nlm.nih.gov/pubmed/11208736?tool=bestpractice.com [2]Heckroth M, Luckett RT, Moser C, et al. Nausea and vomiting in 2021: a comprehensive update. J Clin Gastroenterol. 2021 Apr 1;55(4):279-99. http://www.ncbi.nlm.nih.gov/pubmed/33471485?tool=bestpractice.com ​​​ The presentation can be acute or chronic and ranges from a mildly annoying symptom to a condition that impairs quality of life or is a marker of a life-threatening disease.

There are 2 general mechanisms of nausea and vomiting:

Central neurological

• Stimulation of the area postrema, which 'senses' noxious chemical agents (e.g., poisons, chemotherapy agents, digoxin) and subsequently stimulates the vagal nuclei, which evokes nausea and co-ordinates the emesis reflex.

• Diseases of the central nervous system (CNS), such as infections or brain tumours, stimulate CNS structures and elicit nausea and vomiting, ultimately through vagal pathways.

Peripheral neurological

• Diseases and disorders that originate in peripheral organ systems, such as the gastrointestinal tract, stimulate vagal or spinal afferent nerves that connect with the vagal sensory (tractus solitarius) and vagal efferent motor nuclei. Ultimately, cortical centres where nausea is perceived and the efferent pathways that mediate vomiting are stimulated.

• Tumours, infections, and drugs in the periphery may cause local dysfunction in a variety of organ systems that is sensed as nausea that, when severe, evokes vomiting.