It is not possible to generalize about how many days of blue light irradiation for severe jaundice. It is necessary to find out the root cause of pathological jaundice in order to treat it fundamentally. Irradiation of blue light can help patients break down the bilirubin in the surface layer and excrete it from the body, and the jaundice can subside quickly. The most important treatment is to find out the root cause of jaundice, which can make the bilirubin level drop and jaundice can be treated. The clinical manifestations and primary causes of each patient with pathological jaundice are different, so there is no exact time for irradiation of blue light, and it is necessary to find out whether there are infections, hemolytic jaundice, or breast milk jaundice, etc. This will prevent the body from producing jaundice continuously. In this way, it is possible to avoid the constant production of bilirubin by the organism and to treat the jaundice at its root. When pathological jaundice is detected, it is important to take care of it in a timely manner to avoid bilirubin encephalopathy, which occurs when the bilirubin level is too high, leaving behind problems such as low IQ, etc. It is recommended that the child be treated in a pediatric department of a regular hospital.