Causes and Symptoms of Lead Poisoning. usrecallnews.August 26, 2009. Lead poisoning should be a thing of the past, but recently there have been hundreds of children’s toys recalled for their high lead content. Most of these toys are made in China. In the past, lead paint was the most common source of lead poisoning in children. Although children are at the greatest risk, adults can suffer from lead poisoning as well. [ See ]. Read also related notice from Reuters: Lead-laden paint still widely sold around the world.