Inflammatory bowel disease (IBD) is frequently associated with a variety of
problematic symptoms, including abdominal pain and bowel habit changes, which
are associated with poor patient quality of life and significant healthcare
expenditure. Interestingly, silent IBD, a condition where patients demonstrate
reduced perception and/or reporting of symptoms in the setting of active
inflammation, may be as clinically consequential. This condition has been
associated with serious complications leading to more costly interventions. It
is by its nature an under-recognized phenomenon that affects substantial
portions of patients with either Crohn’s disease or ulcerative colitis. At
the present time, although there are a variety of theories relating to the
underlying causes and contributors, little is known about why this phenomenon
occurs. As a result, there is a lack of cost-effective, reliable diagnostic
methods to identify and manage “at-risk” patients. However, it is
significantly likely that further study and an improved understanding of this
condition will lead to improved approaches for the diagnosis and treatment of
patients with silent IBD as well as other gastrointestinal disorders associated
with alterations in symptomatic perception. In this article, we critically
review studies that have investigated silent IBD. Specifically, we discuss the
following: (1) the methods for defining silent IBD, (2) the known epidemiology
of silent IBD, (3) potential causes of and contributors to this clinical entity,
(4) current diagnostic modalities available to identify it, and (5) gaps in our
understanding as well as potential novel diagnostic and therapeutic applications
that could be developed with further study of this condition.