There are many reasons for liver enlargement, which are often as follows:1. Liver cysts: it is a congenital disease, which is caused by developmental abnormality and sometimes due to trauma, and it needs to go to the hospital to improve the relevant examinations, such as abdominal ultrasound, or abdominal CT to make it clear that a part of the patients can be observed regularly, and another part of the patients need to carry out the interventional therapy, or to do the hepatic cysts windowing operation.2. Liver abscesses: Liver abscess is an infectious disease of liver, need to go to the hospital as soon as possible to give antibiotics for treatment, if necessary, can do percutaneous liver puncture drainage, or surgical treatment.3, liver mass: for example, benign tumors of the liver, or malignant tumors of the liver, etc., need to check the abdominal enhancement of CT, or abdominal magnetic resonance, laboratory tests and so on to make it clear.4, liver parasitic disease: for example, liver cysticercosis.