The purpose of this study is to evaluate the long-term clinical, economic and humanistic outcomes of various treatment regimens, including infliximab, in Crohn's disease in real world medical practice.

The TREAT (The Crohn's Therapy, Resource, Evaluation, and Assessment Tool) registry is a prospective, observational, multicenter, long-term registry featuring clinical, economic, and humanistic measures characterizing the treatment of Crohn's disease. The physicians will track treatments and patient outcomes over at least a 5-year period. Physicians are expected to manage patients as they would under normal practice conditions. No predefined schedule of visits or medical procedures are required. Data are collected on a semi-annual basis by physicians documenting assessment of disease severity, medication use, and adverse events. Upon enrollment, patients complete a health assessment questionnaire. As this is an observational study, no study drugs are administered. Through the course of the Registry, analyses will be performed to support submissions to health authorities, and questions of academic interest.

Inclusion Criteria:

• Patients must be diagnosed with Crohn's Disease

Exclusion Criteria:

• Patients participating in clinical trials for Crohn's disease or other conditions also were not eligible to be enrolled in the TREAT™ Registry
• Patients who are unable to participate in the program for 2 years or more.

Adult patients diagnosed with Crohn's Disease