90％的儿童便秘是功能性便秘。长期以来,人们认为功能性便秘无器质性病变,儿童除便秘外,其它各方面与无便秘的儿童没有任何区别。但是,随着医学科学的发展,现已发现,功能性便秘儿童的肛管静息压比无便秘的正常儿童高,排便时其肛门外括约肌不是放松,而是收缩;直肠内B超发现,功能性便秘儿童的肛门内 90% of children’s constipation is functional constipation. For a long time, people think that functional constipation without organic disease, children with constipation, other aspects and no constipation in children no difference. However, with the development of medical science, it has been found that the anal resting pressure of functional constipation children is higher than that of normal children without constipation, and the external anal sphincter of defecation is not relaxed but contracted during bowel movement. Functional constipation in children’s anus