Lead is a heavy metal that can be found in many places, including water, soil and paint. Exposure to lead has been connected with serious medical conditions, including mental incapacity, renal harm and reproductive troubles. In children it can cause learning disabilities and behavior problems. Lead poisoning occurs when the body absorbs too much of this metal from its environment or through contaminated food or drink sources. It is important to reduce exposure by avoiding contact with lead-containing materials, having regular blood tests done if exposed regularly and ensuring proper nutrition for protection against absorption of the toxic metal into the bloodstream.