The side effects and hazards of interferon are possible systemic discomfort symptoms, neurological symptoms, hard nodules and infections at the injection site, and liver and kidney function damage. 1. Systemic symptoms: long-term use of interferon can cause headache, fever, muscle pain, joint pain and other systemic symptoms. 2. Neurological symptoms: interferon can cause weakness, drowsiness, depression and other neurological symptoms. 3. Hardness and infection at the injection site: Interferon is usually administered by injection, and long-term injection of interferon leads to easy accumulation of the drug at the injection site, which can lead to hardness and infection at the injection site. 4. Liver and kidney function damage: Interferon is mainly metabolized by the liver and kidney after entering the body, long-term use of interferon will easily affect the liver and kidney function, which may cause liver and kidney function damage. The use of interferon must be under the guidance of a professional doctor, do not blindly use the drug on your own.