Metallic taste in the mouth may be a manifestation of heavy metal poisoning, commonly lead poisoning, mercury poisoning, etc. It is recommended to go to the hospital for examination and treatment. 1. Lead poisoning is usually caused by taking too much lead-containing drugs, using lead-containing containers for food, casting or welding and other frequent contact with lead, often with a metallic taste in the mouth, and easy to have lead lines on the gums, which can be treated with lead expulsion. 2. Mercury poisoning is commonly caused by mining mercury, smelting amalgam, etc. Usually, there is a metallic taste in the mouth, saliva and sticky, the whole body may also have dizziness, emotional instability, generally need to drive mercury treatment. It is recommended to go to the hospital to check the blood, urine and other tests to confirm the diagnosis and treatment for the condition.