Bad liver function with low fever may be caused by viral hepatitis, cirrhosis, acute jaundice hepatitis and liver cancer. 1. Viral hepatitis: the liver is infected by viruses, resulting in damage to liver cells, causing poor liver function with low fever. 2. Cirrhosis: Cirrhosis leads to decreased liver function and decreased production of white blood cells, resulting in low-grade fever. 3. Acute jaundice hepatitis: this disease can cause low fever, accompanied by nausea, vomiting, fatigue, yellowing of the skin and sclera and other symptoms. 4. Hepatocellular carcinoma: Liver malignancy in advanced stage can produce tumor fever and cause low fever. If liver function is not good, accompanied by low fever, it is recommended to consult doctor in time, do detailed examination, clarify the cause of disease and treat as early as possible.