The multidisciplinary guideline 'Diagnostics and treatment of irritable bowel syndrome (IBS)' provides the basis for a properly coordinated collaboration between the patient suffering from IBS and all healthcare providers involved in his or her treatment, such as the general practitioner, gastroenterologist, internist, occupational-health physician, dietitian and psychologist. The diagnosis 'IBS' is often made in accordance with diagnostic criteria, such as the Rome III criteria, but a somatic condition needs to be excluded first. If there are no indications for this, additional diagnostic tests are not necessary. Management of the condition consists primarily of advice on life-style plus non-pharmacological interventions, in addition to explaining the condition and providing information. Drug treatment is rarely indicated. If the IBS symptoms have a significant impact on quality of life and patients do not respond to the measures taken in accordance with this general policy, there are three options for psychotherapeutic treatment. When the symptoms result in absenteeism or other work-related problems, the doctor can advise the patient to contact the occupational-health physician and to search for specific solutions in consultation with the employer. When individual advice is required or if the patient's diet is not well-balanced, a referral to the dietitian will follow.