Lead Poisoning: Clinical Manifestations by Severity and Age

Lead toxicity affects multiple systems. Symptoms correlate with blood lead level (BLL) and duration.

Adults / Chronic Low-Level Exposure (BLL 10–40 µg/dL)

• Fatigue, weakness, headache, irritability
• Anorexia, weight loss, abdominal discomfort, constipation
• Arthralgias, myalgias
• Subtle cognitive decline, mood changes
• Hypertension, renal impairment (chronic interstitial nephritis)
• Peripheral neuropathy (motor > sensory; wrist/foot drop)

Severe / Acute Exposure (BLL >40–60 µg/dL)

• Severe abdominal pain (lead colic)
• Encephalopathy: confusion, seizures, coma, cerebral edema
• Hemolytic anemia (basophilic stippling)
• Acute kidney injury

Children (More Vulnerable; BLL >5 µg/dL is CDC reference value)

• Neurodevelopmental: IQ decrement (≈1–2 points per 10 µg/dL), learning disabilities, ADHD-like behavior, executive dysfunction.
• Growth: Stunted stature, delayed puberty.
• Behavioral: Aggression, impulsivity, conduct disorder.
• Hearing/Speech: Delayed language, hearing loss.
• Acute Encephalopathy: At very high levels; fatal if untreated.

Diagnosis and Action

Venous BLL is gold standard. Chelation (succimer, EDTA) indicated for BLL >45 µg/dL (children) or symptomatic adults. Primary prevention: eliminate lead sources (paint, water, soil, occupational, imported goods). No safe level established.