Frequent coughing after lung metastasis of liver cancer can be treated by surgery and other causative treatments; it can also be treated by drugs and other symptomatic treatments. Hepatocellular carcinoma is a malignant tumor of digestive system caused by hepatitis virus, heredity and other factors. When the disease develops to the late stage, lung metastasis can occur, and at this time, there can be clinical symptoms such as coughing, coughing sputum, hemoptysis and so on. In this period, the primary disease should be treated in time through palliative surgery, radiotherapy, chemotherapy, targeted therapy and other methods. In addition, symptomatic treatment can be carried out by taking loquat syrup, ambroxol tablets, compound licorice tablets and other cough and phlegm medications. However, the purpose of treatment in this period is to improve the quality of life and prolong the survival time. All of the above drugs should be applied under the guidance of doctors.