The internal cause of tumor patients is often their own deficiency of vital energy and loss of harmony between qi and blood, and rectal cancer patients mostly have deficiency of spleen and kidney as the fundamental pathogenesis. The local circulation of Qi and blood in the intestine is obstructed, and the nutrients are not enough to moisten the meridians, and the heat evil hurts the blood, so the symptoms of enteritis such as abdominal pain, diarrhea and blood in the stool will appear. Radiation enteritis is a common intestinal complication caused by radiation treatment of pelvic and abdominal malignant tumors, mainly manifested as abdominal pain and diarrhea, urgency and heaviness, anal pain and blood in stool, etc. It is mostly seen in patients with rectal cancer and cervical cancer. It is a combination of deficiency and actuality, with spleen deficiency as the main cause and damp heat as the standard; if the disease is prolonged and becomes chronic, the deficiency of kidney energy is the main cause. Radiation enteritis can be treated with oral Chinese medicine with topical application of drugs. Internal treatment is to strengthen the spleen, detoxify dampness, clear heat and harmonize qi and blood as the main method of treatment, commonly used in the party ginseng, atractylodes, white lentils, yams, gorgonians, licorice and other drugs to strengthen the spleen and benefit qi; coix seeds, poria, pelargonium, Chen Pi, half summer and other drugs to permeate dampness; to horsetail, septoria, scutellaria, white quercus, white head, horsetail and other drugs to clear heat and detoxify; peony, mullein, angelica, acacia, heliotrope, Chuanxiong and other drugs to harmonize qi and blood. External treatment can be done by fumigation with Chinese herbal decoction, retaining the enema to enable the drug to act directly on the anus or intestinal lesions locally, and its treatment is the same as internal tonics, often with the legislation of drying dampness, detoxifying and cooling the blood. Commonly used drugs include Atractylodes macrocephala, Phellodendron, Phellodendron, Phellodendron, Phellodendron, Angelica dahurica, Phellodendron, Phyllanthus, etc.