Fever as soon as the liver abscess reaches the evening may indicate a reaction of the immune system, and prompt treatment is recommended. Liver abscesses are usually caused by bacterial infections such as Klebsiella pneumoniae, staphylococcus, and Escherichia coli. Common types include bacterial liver abscess, amoebic liver abscess, etc. Fever by evening may be due to increased irritation caused by bacterial or viral infection, which causes the body’s immune system to react, and may be more serious, prompt medical treatment is recommended. Treatment of liver abscess includes nutritional support, correction of disorders of water and electrolyte balance, antimicrobial treatment with metronidazole, ampicillin or sensitive antibiotics, blood transfusion if necessary, and puncture and drainage of abscesses in severe cases. Drugs need to follow the doctor’s instructions for rational application.