Lead poisoning is a condition, also known as plumbism or painter's colic, caused by increased blood serum lead levels.
The symptoms of lead poisoning include neurological problems, such as reduced IQ, nausea, abdominal pain, irritability, insomnia, excess lethargy or hyperactivity, headache and, in extreme cases, seizure and coma.
There are also associated gastrointestinal problems, such as constipation, diarrhea, abdominal pain, vomiting, poor appetite, weight loss.
Other associated affects are anemia, kidney problems, and reproductive problems.
In humans, lead toxicity often causes the formation of bluish line along the gums, which is known as the "Burtons's line."