According to the causes of intestinal obstruction, ulcerative colitis, severe hypokalemia, etc., the treatment modes include medication, surgery and so on. 1. Intestinal obstruction: due to mechanical factors, dynamics and other causes of intestinal obstruction, the patient may have a localized cystic bag-like dilatation of the rectum, at this time, the patient’s treatment mainly includes correcting the water and electrolyte disorders; antibiotic treatment, such as cefuroxime, etc.; surgical treatment, such as adhesion laxation, intestinal resection, etc.. 2. Ulcerative colitis: when patients with ulcerative colitis have extensive lesions, the use of anticholinergics induces heavy or fulminant ulcerative colitis, presenting localized rectal pouch-like dilatation, and the main treatments include medication, such as aminosalicylic acid, glucocorticosteroids and so on, and surgical treatments, such as proctocolectomy and so on. 3. Severe hypokalemia: when patients have hypokalemia due to various reasons such as insufficient intake, improper use of potassium diuretics, etc., it makes the peristaltic power of the intestinal tract decrease, which can make the rectum locally dilated in the form of a pouch, and at this time, firstly, treat the primary disease, such as reducing the use of potassium diuretics and reasonably supplementing the treatment with potassium salts. Localized rectal pouch expansion is also seen in other causes, should be timely to the hospital for further examination, under the guidance of a professional doctor for treatment, do not take medication without authorization, so as not to delay the condition.