Diagnosis and Assessment
Table 2. Differential Diagnosis of IBS Symptoms Infection
• Parasitic • HIV and associated infections • Viral gastroenteritis
Food and diet
• Lactose intolerance • Fructose intolerance • Fatty foods • Alcohol
Other functional gastrointestinal disorders
• Functional abdominal pain • Functional dyspepsia
Other organic gastrointestinal disorders
• Crohn's disease • Ulcerative colitis • Microscopic/collagenous colitis • Celiac disease • Ischemic colitis
Gynecologic conditions
• Endometriosis • Dysmenorrhea
Neurologic conditions
• Spinal cord pathology • Multiple sclerosis
Endocrine or metabolic disorders
• Thyroid disorder • Diabetes mellitus • Pancreatic endocrine tumors
Psychiatric disorders
• Panic disorder • Somatization
• Antibiotics • Chemotherapy agents • Opiates • Antidepressants • Laxative use/abuse
• Anxiety disorder Gastrointestinal symptoms related to medications
• NSAIDs • PPIs • Antihypertensive agents (eg, calcium-channel blockers)
• Hypercalcemia • Acute intermittent porphyria • Amyloidosis
• Parkinson's disease • Dysautonomia
• Ovarian cancer
• Bowel obstruction • Pancreatic insufficiency • Bile acid related disorders • Postgastrectomy disorders • SIBO
• Functional diarrhea/constipation
• Caffeine • Food allergy • Artificial sweeteners • Gluten intolerance or sensitivity
• Amoebic infections • Giardiasis
