Cryptogenic hepatitis B infection is more probable, but lacks the basis for large-scale population-based flow surveys. Occult hepatitis B, also known as cryptogenic hepatitis B virus infection is an infection with the hepatitis B virus in the absence of conscious symptoms, and there are two main regressions for infected individuals, one in which the infection develops into a patient with chronic hepatitis B virus, and the other in which the patient is cured. Such people are negative for hepatitis B surface antigen, but the hepatitis B virus can be found in serum or liver puncture tissue. People with occult hepatitis B infection, whether they develop into chronic patients or are cured, have no obvious clinical symptoms throughout the process. According to various epidemiologic patterns, there is a greater chance of occult hepatitis B infection, and most remain clinically asymptomatic, with certain patients found to have hepatitis B on physical examination. At present, there is a lack of epidemiological investigation and statistics on people with hidden hepatitis B infection, and there is no strong basis for evaluating its probability.