Crohn's disease is the most common type of disease.

Crohn's disease is mainly diagnosed as ulcerative colitis, intestinal tuberculosis, small intestinal malignant lymphoma, etc.

1. Ulcerative colitis

Crohn's disease lesions are mostly located in the ileocecal part of the intestine and adjacent to the right colon, and the lesions can involve the whole layer of the intestinal wall; while ulcerative colitis lesions are mainly located in the rectum and sigmoid colon, and the lesions generally involve the mucosa and submucosa.

2. Intestinal tuberculosis

Intestinal tuberculosis lesions are consistent with Crohn's disease, but the lesion level is generally limited to the superficial layer or deep layer, and will not involve the whole layer.

3. Small intestinal malignant lymphoma

Small intestinal malignant lymphoma early will be limited to the small intestine, with the development of the disease can involve the whole intestine, even other organs, and the lesions will gradually infiltrate from the mucosa layer to the deep layer until the whole layer of the intestinal wall is involved.