Bowel Dysfunction - Overview

Bowel dysfunction is a condition that can have many different causes. There could be a neurological disease affecting the spine/brain pathways which affects the bowel control, or an obstruction. For some individuals there are no underlying medical reasons why the bowel does not function, and there may be psychological reasons for why the bowel does not function properly.

Regardless of the reasons for bowel dysfunction, the impact on quality of life is immense. People with symptoms of bowel dysfunction often socially restrict themselves, or isolate themselves completely. They will likely have little or no self-confidence, close relationships may be impaired, ability to work can be difficult, and the financial complications associated with medication, or costs of containment may all be a huge obstacle to normal daily living. 

Neurogenic bowel dysfunction (NBD)

NBD is the term used to describe dysfunction of the colon due to disruption of nerve signals. This can clead to disrupted peristalsis and interruption to urge signals.  This results in the bowel becoming distended and consiberable slow down intransit time for the stools to move along the bowel.  The longer the stools remain in the bowel the more water is reabsorbed from the stool which leaves the faecal matter harder and even more difficult to pass.  Frequency of evacuation becomes very slow and unpredictable.  When evacuation does occur, it can be very painful, and may take many hours, with accompanying sensations of incomplete emptying and soiling.  For some individuals their bowels spontaneously empty with little warning.

Examples of conditions that may be affected by NBDs are:

  • Spinal cord injury; traumatic or disease acquired                            
  • Parkinson’s disease
  • Multiple Sclerosis
  • After stroke

Functional bowel disorders (FBD)

Bowel disorders without any morphological, metabolic or neurologic cause are called functional bowel disorders. There are other definitions in the literature but generally a FBD is diagnosed after full investigations which fail to identify an underlying organic cause.

Examples of FBDs are:

  • Chronic constipation (or functional constipation)
  • Fecal incontinence
  • Slow transit constipation (STC)

Other causes of bowel dysfunction

Organic causes may vary from congenital conditions like Hirschsprung disease and anorectal malformations, to metabolic to endocrine disorders, pelvic floor dysfunctions and post-surgical conditions. Use of certain medications may also affect the bowel function.

The differences between the dysfunctions are the cause of the symptoms, not the symptoms. 

Symptoms of bowel dysfunction may include:

  • Abdominal pain
  • Abdominal distention
  • Early satiety
  • Loss of voluntary control over defecation (fecal incontinence)
  • Difficulty with evacuation (constipation)
  • Associated neurologic bladder symptoms