Heavy metal poisoning refers to the toxic effects that occur when heavy metals, such as lead, mercury or cadmium, accumulate in the body and disrupt normal physiological processes. These metals can be absorbed through ingestion, inhalation or skin contact, and their presence can cause damage to various organs including the brain, kidneys, liver, heart and bones. Symptoms of heavy metal poisoning vary depending on the specific metal involved but may include nausea, vomiting, diarrhea, abdominal pain, headaches, muscle weakness or joint pain. In severe cases, heavy metal poisoning can lead to organ failure, coma and even death if left untreated.