There is no “igG rapid decline method”, lgG antibody is the main antibody component in the serum, and its elevation can be seen in the recent rubella virus infection, hepatitis A and other diseases, you need to carry out targeted treatment under the guidance of the doctor, such as general treatment, medication, etc., lgG can be reduced after active treatment. 1. Rubella virus infection: common in rubella, need to do a good job of isolation, disinfection, accompanied by fever symptoms can be used ibuprofen and other antipyretic and analgesic drugs, coughing sputum and sputum thick symptoms can be used to alleviate the use of aminoglutethimide, rubella encephalitis can be relieved by drip mannitol patients. 2. Hepatitis A: It is recommended to take bed rest, supplement food rich in vitamins and high quality protein, and in the acute stage, isolation is needed, and silymarin and adenosylmethionine can be used to protect the liver. It is recommended to go to the hospital when there is a rise in lgG, and ask the doctor to make a judgment and give a treatment plan.