http://en.wikipedia.org/wiki/Lead_poisoning

Lead poisoning (also known as plumbism, colica Pictonum, saturnism,
Devon colic, or painter's colic) is a medical condition caused by
increased levels of the heavy metal lead in the body. Lead interferes
with a variety of body processes and is toxic to many organs and tissues
including the heart, bones, intestines, kidneys, and reproductive and
nervous systems. It interferes with the development of the nervous
system and is therefore particularly toxic to children, causing
potentially permanent learning and behavior disorders. Symptoms include
abdominal pain, confusion, headache, anemia, irritability, and in severe
cases seizures, coma, and death.