Immune tolerance occurs during the early years of the infection. Although you have a lot of hepatitis B virus in your body, your immune system does not recognize that your liver is infected and so does not fight the virus at all. As a result, there is little or no damage to the liver, and you are totally free of symptoms.
Immune damage occurs when your immune system starts fighting the virus which results in damage to your liver. This phase can last for months or years. The longer your immune system fights, the more damage is caused to your liver. Yet, most people will have no symptoms despite active liver damage. Only abnormal blood tests will reveal any liver damage at this stage. You may need treatment if you are in this phase.
Immune control occurs when your body finally takes control of the virus and your hepatitis B becomes inactive. However, not everyone with hepatitis B can reach this phase without treatment.
Immune reactivation happens when the virus becomes active again after a long period of inactivity. Your body can no longer control the virus either because the virus has changed or mutated, or because your immune system is weakened.