Lead poisoning occurs when lead, a toxic metal, builds up in the body, often over months or years. It can affect anyone, but young children are particularly vulnerable because their developing brains and bodies absorb lead more easily. Common sources of lead exposure include old paint, contaminated soil, and plumbing pipes made of lead. Symptoms of lead poisoning can vary but may include abdominal pain, fatigue, and developmental delays in children. Long-term exposure can lead to serious health issues, including damage to the nervous system and kidneys. Preventing lead exposure is crucial, especially in homes built before 1978, when lead-based paint was banned in the United States.