When you have hepatitis B your liver becomes inflamed.
Inside your liver there are functional parts called hepatic lobules,they filter your blood.When your blood cells pass through these functions destroy any harmful substances in your body.
A way to get hepatitis B is by sharing blood with someone who is infected with the virus,it could be by sharing a drug syringe(this is why we don't do drugs people!)
When it enter your body,it invades the liver cells and makes copies of itself.As a response your immune system comes to destroy the virus but it also attacks your liver cells.Later your liver cell become inflamed and then die.When that happens scar tissues form around the dead liver cells and prevents your liver from working properly.
If you have cirrhosis(many scar tissues)it can cause permanent shrinking and prevents proper blood flow
Usually your immune system will remove all the hepatitis B viruses.In children their immune system might not be able to remove the virus.
If you have the virus and your immune army is can't handle it,your doctor might recommend an antiviral medication.
If it's a severe case your doctor may do a liver transplant.
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