Table 1 Rome III criteria for functional constipation and irritable bowel syndrome

Functional Constipation

 Diagnostic criteria ^a

 1. Must include two or more of the following:

  α. Straining during at least 25% of defecations

  β. Lumpy or hard stools in at least 25% of defecations

  γ. Sensation of incomplete evacuation for at least 25% of defecations

  δ. Sensation of anorectal obstruction/blockage for at least 25% of defecations

  ε. Manual manoeuvres to facilitate at least 25% of defecations (e.g. digital evacuation, support of the pelvic floor)

 η. Fewer than three defecations per week

 2. Loose stools are rarely present without the use of laxatives

 3. Insufficient criteria for irritable bowel syndrome

  ^aCriteria fulfilled for the last 3 months with symptoms onset at least 6 months prior to diagnosis

Irritable Bowel Syndrome with Constipation

  Diagnostic criteria ^a

 Recurrent abdominal pain or discomfort ^b at least 3 days/month in the last 3 months associated with two or more of the following:

 -Improvement with defecation

 -Onset associated with a change in frequency of stool

 -Onset associated with a change in form (appearance) of stool (hard or lumpy stools ≥25% and loose or watery stools <25% of bowel movements)