Why is lead poisoning considered so dangerous?

Plumbism. Lead is a toxin that has several effects. It can cause brain swelling, brain damage and retardation, damage to peripheral nerves, alterations in consciousness, disorders of attention and learning, at very high levels it can cause death.
Many bad effects. Lead poisoning can cause headaches, abdominal pain, anemia, loss of vision, and dementia. In children, it can interfere with their ability to learn.