Occupation of the left outer lobe of the liver is an abnormal phenomenon, which is generally considered to be caused by hepatic hemangioma, hepatic cyst, liver cancer and other diseases. 1. Hepatic hemangioma: the cause of the disease is not yet clear, but it is considered to be related to congenital vascular development abnormality, abnormal hormone level and other factors. When hemangioma appears in the left side of liver, the left outer lobe of liver can be seen occupying the position through imaging examination. The patient often accompanied by epigastric discomfort, vomiting, pain in the liver area and other uncomfortable symptoms. 2. Liver cysts: when cysts appear in the left side of the liver, the left outer lobe of the liver can also be occupied through imaging examination. When the lesion is large, it may cause the patient to suffer from epigastric mass, abdominal pain, loss of appetite, nausea and vomiting, and other discomforts. 3. Liver cancer: the cause and pathogenesis of primary liver cancer are not clear, but it is considered to be related to alcoholism and viral hepatitis, while secondary liver cancer is the metastasis of cancer from other organs to the liver. When some liver cancer patients go to the doctor for examination, the left outer lobe of the liver can also be occupied. Common symptoms of liver cancer patients include abdominal pain, epigastric mass, body fatigue, weight loss, loss of appetite and so on. In addition, hepatic adenoma and focal hyperplastic nodule of liver also manifest as hepatic left external lobe occupation. There are many causes of hepatic left lobe hyperplasia, so it is recommended that the patient should undergo further detailed examination in order to clarify the disease and cooperate with the doctor’s treatment, so as to promote the restoration of the health of the organism.