What is Metal Poisoning Metal toxicity or metal poisoning is the toxic effect of certain metals in certain forms and doses on life . Some metals are toxic when they form poisonous soluble compounds. Certain metals have no biological role, nor essential minerals, or toxic when in a certain form. In the case of lead , any measurable amount may have negative health effects. The most common metals that human body can absorb in toxic amount are: 1. Mercury - Mercury poisoning is a type of metal poisoning due to exposure to mercury . Symptoms - depend upon the type, dose, method, and duration of exposure. Which include; muscle weakness , poor coordination, numbness in the hands and feet , skin rashes, anxiety, memory problems, trouble speaking, trouble hearing, or trouble seeing. High-level exposur...