Slightly high serum copper is not harmful to the human body, but if it is persistently high or the value is high, it may cause liver damage, digestive system damage, nervous system damage and so on. 1. Liver damage: high serum copper can cause liver damage, which may cause acute hepatitis, chronic hepatitis, liver failure and other symptoms. 2. Digestive system damage: high serum copper may cause nausea, vomiting, abdominal pain, gastrointestinal mucosal ulcers and other digestive system damage. 3. Nervous system damage: high serum copper may cause dystonia, limb stiffness and motor retardation and other symptoms. Once the serum copper deviation occurs, you should go to the hospital in time and take standardized treatment under the guidance of the doctor.