interactions among HBV, hepatocytes, and the host immune system. Natural history studies of chronic hepatitis B (CHB) infection have shown an association between active viral replication and adverse clinical outcomes such as cirrhosis and hepatocellular carcinoma. The goal of therapy for CHB is to improve quality of life and survival by preventing progression of the disease to cirrhosis, decompensation, end-stage liver disease, hepatocellular carcinoma (HCC) and death. This goal can be achieved if HBV replication is suppressed in a sustained manner. The accompanying reduction in histological activity of CHB lessens the risk of cirrhosis and of HCC, particularly in non-cirrhotic patients. However, CHB infection cannot be completely eradicated, due to the persistence of covalently closed circular DNA in the nucleus of infected hepatocytes, which may explain HBV reactivation. Moreover, the integration of the HBV genome into the host genome may favour oncogenesis, development of HCC and may also contribute to HBV reactivation. Core tip: The goal of therapy for chronic hepatitis B is to improve quality of life and survival by preventing progression of the disease to cirrhosis, decompensation, end-stage liver disease, hepatocellular carcinoma and death. Current therapeutic options do not eradicate hepatitis B virus (HBV) infection, since HBV remains either integrated in the host genome or in the nuclei of hepatocytes as covalently closed circular DNA, a fact that may favour oncogenesis towards the development of hepatocellular carcinoma, and explains HBV reactivation. It is mandatory for clinicians to start viral suppression in patients with active chronic liver disease, particularly in