The common causes of small bowel obstruction include intestinal adhesion, intestinal foreign body, intussusception, intestinal tumor and so on. 1. Intestinal adhesion: after some laparotomy and trauma, it may cause different degrees of adhesion between the small intestine or between the small intestine and the surrounding tissues and organs, thus forming intestinal obstruction. 2. Intestinal foreign bodies: If there are foreign bodies accidentally swallowed in the intestines, dry and hard stools, parasitic masses, etc., the intestines can also be blocked, causing small intestinal obstruction. 3. Intussusception: Intussusception means that the intestines and intestines are set together, which is usually more common in children, and this condition can also cause small intestinal obstruction. 4. Intestinal tumor: If there is a tumor or polyp in the intestines, the contents of the intestines can not pass smoothly, causing intestinal obstruction. 5. Thromboembolism: mesenteric vascular embolism leads to necrosis of local intestinal segments due to loss of blood supply and loss of peristalsis, which can lead to intestinal obstruction. 6. Nerve paralysis: due to various reasons, it affects the balance of intestinal autonomic nervous system, or affects the local nerve conduction of intestinal tract, or affects the contraction of intestinal smooth muscle to make the intestinal tube dilate and peristalsis disappears, thus forming paralytic intestinal obstruction. Abdominal pain, vomiting, anal defecation or even disappearance of the early symptoms of intestinal obstruction, should be timely to the hospital, improve the examination and diagnosis to be treated accordingly.