Hepatitis B is an acute and chronic disease of the liver caused by the hepatitis B virus and is contagious. Usually, it is not possible to self-test for hepatitis B. You need to go to the hospital for the five tests for hepatitis B. The five hepatitis B tests mainly include tests for surface antigen, surface antibody, e antigen, e antibody and core antibody, which is the gold standard for hepatitis B. If the hepatitis B surface antigen is positive, it indicates that the person is infected with the hepatitis B virus, and further tests such as liver function, hepatitis B DNA and liver ultrasound can be performed to assess the condition. However, a few patients who are in the acute phase of acute hepatitis B or chronic hepatitis B attack or activity may have some symptoms due to impaired liver function, and may also consider the need for medical examination through the following symptoms: 1. Local symptoms: mainly digestive symptoms, such as loss of appetite, abdominal distension, diarrhea, abdominal pain, anorexia, anorexia of oil, etc., may also appear yellow urine, and when jaundice is more serious, patients may even may develop symptoms of yellowing of the eyes and face; 2. Systemic symptoms: such as weakness, exercise, decreased desire for activity that lasts for more than a few days without other causes that can be explained, and some patients may also develop systemic symptoms such as low fever, rash, and arthralgia. Patients should note that there are no other obvious specific symptoms of hepatitis B. Many other lesions such as digestive tract diseases and liver-like diseases may also show the same or similar symptoms as mentioned above. Therefore, patients still need to go to the hospital for laboratory tests to make a diagnosis based on whether the transaminases in the body are elevated. In addition, people who have close contact with hepatitis B patients and infants and children who have not been vaccinated against hepatitis B should pay particular attention, as these people are at higher risk of contracting hepatitis B than normal people.