Hepatitis B is an infectious disease caused by the hepatitis B virus that infects the body. In acute hepatitis B, a mild to moderate fever may develop in the early stages of the disease, lasting from 1-3 days, while in chronic hepatitis B, fever is not usually seen unless there is a combination of other infections. The symptoms seen are often digestive symptoms and discomfort in the liver area, or in severe cases, jaundice, with yellowing of the body and eyes and yellowing of the urine. The most obvious symptoms in patients are gastrointestinal and digestive symptoms, which may also be accompanied by significant malaise. Fever may occur in patients with acute hepatitis B when systemic symptoms are more pronounced, or it may be accompanied by a cold or other viral infection. The reason why hepatitis B patients do not develop fever is related to the characteristics of the viral infection, which mainly damages the liver and does not cause respiratory or other infections.