Crohn's disease is abbreviated as CD in English, and it is also known as segmental enteritis, localized enteritis, or granulomatous ileocolitis. The clinical symptoms include abdominal pain, diarrhea, intestinal obstruction, fever, and nutritional disorders. It can affect organs such as the joints, skin, and liver. Complications can often include intestinal obstruction, malabsorption, acute perforation, and rectal bleeding. Clinically, it can be diagnosed through routine blood tests, blood gas analysis, colonoscopy, barium enema, CT scans, etc. Dietary guidelines generally include eating smaller, more frequent meals and a low-fat diet. The treatment principle is a combination of medication and surgery.