There are two kinds of copper poisoning: acute and chronic. Acute poisoning is mainly manifested as acute inflammation of the gastrointestinal tract, with a metallic taste in the mouth, salivation, nausea, vomiting or pain in the upper abdomen, diarrhea, and sometimes there may be symptoms of upper gastrointestinal bleeding such as vomiting blood and black stools. If swallowed in large quantities, the teeth, gums and tongue will turn blue or green, and the vomit will also be blue-green, and in severe cases, death may occur due to kidney failure. Chronic copper poisoning is caused by long-term inhalation of large amounts of copper-containing gas or intake of food containing high levels of copper, and X-rays can reveal a large number of striated fibrotic shadows in the lungs, and some have nodular shadows, which may be related to the chronic stimulation of copper and lung infection. Neurological manifestations are memory loss, inattention, agitation, and possibly polyneuritis and neurasthenia. The peripheral nervous system is more sensitive than the central nervous system, showing abnormal brain waves. The digestive system may also show symptoms of loss of appetite, nausea, vomiting, abdominal pain, diarrhea, jaundice, and some patients may show enlargement of the liver and spleen and abnormal liver function.