The main clinical manifestations of intestinal obstruction include abdominal pain, abdominal distension, vomiting, and cessation of gas and bowel movements from the anus. During the physical examination, tenderness in the abdomen can be observed, as well as hyperactive bowel sounds. Laboratory tests may reveal increased red and white blood cell counts, and electrolyte imbalances. Supplementary examinations, such as abdominal X-ray films, can show dilation of the intestinal tube, air and fluid accumulation within the abdominal cavity, and the presence of fluid-air levels. Abdominal ultrasound can also reveal air and fluid accumulation in the intestinal tube. Through the above examinations, intestinal obstruction can be diagnosed.