[Guidelines for diagnosis and treatment of constipation in Mexico. B) Diagnostic approach].

Background: Constipation is a heterogeneous symptom so an accurate diagnosis requires an appropriate approach.
Objective and Methods: To establish the clinical guidelines for diagnosis and treatment of chronic constipation in Mexico we have reviewed the diagnostic aspects of constipation according to the availability of resources in our country. In addition, evidence-based recommendations have been provided.
Results: The symptoms that best define constipation in our population are infrequent stool, hard stool expulsion, excessive effort and sensation of incomplete evacuation. Digital rectal examination is a useful diagnostic tool to discard organic diseases and pelvic floor dyssynergia. Patients with risk factors such as recent onset of constipation, family history of inflammatory bowel disease or colon cancer and those with alarm signs (unintentional weight loss and significant anemia, blood in stool) should undergo endoscopic diagnostic studies. If they are available, the most useful tests in evaluating patients with functional constipation are colonic transit with radiopaque markers and anorectal manometry with balloon expulsion test.
Conclusions: Patients with symptoms of chronic constipation should undergo advanced colorectal physiological studies to try to establish the cause of constipation.