The left side of abdomen with hyperactive bowel sounds is considered to be excessive hunger, acute gastroenteritis, intestinal obstruction, left hemicolon cancer and so on. 1. Excessive hunger: when the body is in a state of hunger, intestinal peristalsis can be increased due to the phenomenon of hyperactive bowel sounds on the left side of the abdomen, which is mostly relieved after proper feeding. 2. Acute gastroenteritis: the disease is associated with pathogenic microbial infection, intake of irritating food, alcoholism and other factors. The main manifestations of acute gastroenteritis patients are diarrhea, abdominal pain, nausea and vomiting, fever, loss of appetite and other symptoms. Some patients can be stimulated by the gastrointestinal tract and the phenomenon of intestinal hyperphonia. 3. Intestinal obstruction: Intestinal adhesion after abdominal surgery, intestinal torsion, intussusception and intestinal inflammatory diseases can cause intestinal obstruction. Typical symptoms of intestinal obstruction include abdominal pain, loss of appetite, vomiting, abdominal distension, stopping anal defecation and hyperactive bowel sounds, etc. When the left side of intestines is obstructed, it can be manifested as hyperactive bowel sounds on the left side of abdomen. 4. Left half colon cancer: left half colon cancer can cause some patients to have hyperactive bowel sounds on the left side of the abdomen. The cause of left-sided colon cancer is still unclear, which may be related to genetic factors, bad life habits, etc. Typical symptoms of patients include weight loss, blood in stool, abdominal pain, abdominal distension, etc. The cause of left-sided colon cancer is not clear. There are many causes of left side of abdomen and hyperactive bowel sounds, such as dyspepsia, ulcerative colitis, intestinal parasitic infection and so on. It is recommended that patients seek timely medical examination to clarify the cause of the disease and then follow the doctor’s instructions for treatment.