There is no absolute fast laxative method, the causes of constipation include functional constipation (can eat fiber-rich food, laxative medicine, etc.), intestinal lesions (such as intestinal obstruction, etc., need gastrointestinal decompression, surgery and other treatments), systemic lesions (such as diabetes mellitus, etc., can eat fiber-rich food, laxative medicine, etc.), need to be specifically analyzed. 1. Functional constipation: it refers to the constipation that occurs without organic diseases, which can be improved through appropriate activities, consumption of fiber-rich foods (such as celery, leek, dragon fruit, etc.), laxatives (such as lactulose, etc.), and so on. 2. Intestinal lesions: Intestinal lesions such as tumor-induced intestinal obstruction can lead to constipation, which requires gastrointestinal decompression, surgery and other symptomatic treatments. 3. Systemic lesions: systemic lesions such as diabetes can also lead to constipation, with diabetes secondary to plant neuropathy related to the control of blood glucose on the basis of eating fiber-rich foods (such as celery, leeks, etc.), coarse grains, etc., can be applied to laxative drugs (such as Keserol) to assist in laxative and so on. There are many causes of constipation, it is recommended to consult a doctor in time to clarify the diagnosis, under the guidance of the doctor for proper treatment.