Irish Journal of Medical Science

, Volume 182, Issue 1, pp 1–6

Bugs on the brain; brain in the gut—seeking explanations for common gastrointestinal symptoms

Review Article

DOI: 10.1007/s11845-012-0865-y

Cite this article as:
Quigley, E.M.M. Ir J Med Sci (2013) 182: 1. doi:10.1007/s11845-012-0865-y



Gastrointestinal symptoms such as heartburn, indigestion (or dyspepsia), bloating, distension, constipation, abdominal pain, abdominal discomfort and diarrhoea are extremely common worldwide. For some, such symptoms can prove to be chronic and disabling.


The recent literature on irritable bowel syndrome and, in particular, work emanating form this authors research group, was reviewed.


These functional symptoms commonly occur in aggregations, referred to as functional gastrointestinal disorders (FGIDs). Some of the FGIDs and, most notably irritable bowel syndrome (IBS), have achieved a degree of scientific and clinical credibility as coherent entities. Several lines of evidence ranging from gut motility to the microbiota are under investigation in attempts to explain IBS or its symptomatology.


Though biomarkers for IBS and other FGIDs have proven elusive, considerable progress has been made in understanding possible aetiological factors in IBS; progress which may well lead to better therapeutic strategies.


Functional gastrointestinal disordersIrritable bowel syndromeMicrobiotaCytokinesGut-brain axis

Copyright information

© Royal Academy of Medicine in Ireland 2012

Authors and Affiliations

  1. 1.Department of Medicine, Alimentary Pharmbiotic CentreUniversity College Cork, Cork University HospitalCorkIreland