Lead is a natural metal found in the environment. Lead is toxic and has no known function in the human body.
Young children are most susceptible to the toxic effects of lead.
Long-term exposure to even low levels of lead can cause irreversible learning difficulties, mental retardation, and delayed neurological and physical development. In adults, exposure to lead affects primarily the peripheral nervous system and can cause impairment of hearing, vision, and muscle coordination. Lead also damages the blood, kidneys, heart and reproductive system. Lead poisoning is a particularly insidious public health threat because there may be no unique signs or symptoms. Early symptoms of poisoning may include loss of appetite, fatigue, irritability, anemia, and abdominal pain.