Hepatitis B is mainly caused by the damage of the liver by the hepatitis B virus. Therefore, patients with hepatitis B are advised to have regular check - ups of liver function, hepatitis B DNA, and liver ultrasound to keep track of the disease progression. If necessary, they can receive anti - hepatitis B virus treatment.Hepatitis B alone does not cause fatty liver. Fatty liver is mainly caused by obesity or alcohol consumption and is closely related to diet. For example, if patients prefer greasy or high - calorie foods or drink a large amount of alcohol over a long period, these factors can easily lead to fatty liver, which has nothing to do with hepatitis B.So, patients with hepatitis B should have regular check - ups, exercise actively to avoid developing fatty liver, and strictly abstain from alcohol.