Lead poisoning

Page most recently updated 7 September 2026

This page focuses on the reported psychiatric associations, which may be the initial presenting manifestation, and on other clinical features that may assist the psychiatrist or primary care physician in identifying the underlying diagnosis, considered through the lenses of the diagnostic lenses framework.

Lead poisoning is a toxicologic disorder that can produce neuropsychiatric and multisystemic manifestations, with clinical features varying according to the dose, route, and duration of exposure. A distinctive presentation may include the combination of behavioural or cognitive change, peripheral neuropathy, abdominal symptoms, and a relevant environmental or occupational exposure.

Exposure clues include occupational exposure in battery manufacturing or recycling, smelting, metal processing, construction, painting, and shooting-related work, as well as exposure to lead-containing dust, paint, soil, or contaminated water. Exposure may also occur through certain traditional or imported remedies, cosmetics, pottery, or other consumer products. Children may be exposed through deteriorating lead-based paint and contaminated household dust or soil, while adults may be exposed through occupational or hobby-related activities. Both inhalation and ingestion are important routes of exposure.

It can present with psychiatric features such as irritability, emotional lability, anxiety, depression, insomnia, impaired concentration, cognitive impairment, and personality or behavioural change, and less commonly, psychotic symptoms.

Other characteristic features include peripheral motor neuropathy, which may produce distal weakness and, classically, wrist or foot drop. Encephalopathy may occur with more severe exposure and can manifest with headache, confusion, cognitive impairment, seizures, or coma. Other neurological manifestations include paraesthesia, ataxia, tremor, and impaired coordination.

From a multisystemic lens perspective, clinical features in other body systems include (but are not limited to):

  • Gastrointestinal: Abdominal colic, abdominal pain, nausea, vomiting and constipation; severe poisoning may cause ileus or other gastrointestinal complications.

  • Hematologic: Anaemia, often with basophilic stippling of erythrocytes; inhibition of haem synthesis may produce elevated zinc protoporphyrin and other biochemical abnormalities.

  • Renal/electrolytes: Proximal tubular injury and, particularly with chronic exposure, chronic kidney disease and hyperuricaemia.

  • Musculoskeletal: Arthralgia, myalgia and joint or limb pain may occur, particularly with chronic exposure.

Early diagnosis is important because lead poisoning can cause persistent or irreversible neurological and cognitive injury and, depending on the severity and duration of exposure, significant hematologic, renal, gastrointestinal, or other systemic complications. Prompt recognition allows removal from the exposure source, measurement of blood lead levels, and consideration of chelation therapy when indicated.

Selected references and further reading — Multisystemic lens

Cardinal RN, Bullmore ET. The diagnosis of psychosis. Cambridge: Cambridge University Press; 2011.

Sachdev PS, Keshavan MS, editors. Secondary schizophrenia. Cambridge: Cambridge University Press; 2010.

Levenson JL, editor. The American Psychiatric Association Publishing textbook of psychosomatic medicine and consultation-liaison psychiatry. 3rd ed. Washington (DC): American Psychiatric Association Publishing; 2019.

Stern TA, Beach SR, Smith FA, Freudenreich O, Vranceau AM, Fava M, editors. Massachusetts General Hospital handbook of general hospital psychiatry. 8th ed. Philadelphia: Elsevier; 2025.

Arciniegas DB, Yudofsky SC, Hales RE, editors. The American Psychiatric Association Publishing textbook of neuropsychiatry and clinical neurosciences. 6th ed. Washington (DC): American Psychiatric Association Publishing; 2018.

Agrawal N, Faruqui R, Bodani M, editors. Oxford textbook of neuropsychiatry. Oxford: Oxford University Press; 2020.

Boland R, Verduin M, editors. Kaplan and Sadock's comprehensive textbook of psychiatry. 11th ed. Philadelphia: Wolters Kluwer; 2024.

Loscalzo J, Fauci AS, Kasper DL, Hauser SL, Longo DL, Jameson JL, editors. Harrison's principles of internal medicine. 22nd ed. New York: McGraw Hill; 2025.