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Lead Poisoning

Lead Poisoning:

High levels of lead were found in the blood of thousands of children living around the Kabwe mine in Zambia.

  • Lead poisoning or chronic intoxication is caused by the absorption of Lead in the system and is characterised especially by fatigue, abdominal pain, nausea, diarrhoea, loss of appetite, anaemia, a dark line along the gums, and muscle paralysis or weakness of limbs.
  • Children younger than 6 years are especially vulnerable to lead poisoning, which can severely affect mental and physical development.
  • At very high levels, lead poisoning can be fatal.
  • Lead exposure also causes anaemia, hypertension, renal impairment, immunotoxicity and toxicity to the reproductive organs.
  • More than three quarters of global lead consumption is for the manufacture of lead-acid batteries for motor vehicles.
  • People can become exposed to lead through occupational and environmental sources.
  • This mainly results from:
    • Inhalation of lead particles generated by burning materials containing lead, for example during smelting, recycling, stripping leaded paint and using leaded aviation fuel, and
    • Ingestion of lead-contaminated dust, water (from leaded pipes) and food (from lead-glazed or lead-soldered containers).

Lead:

  • Lead is a naturally occurring toxic metal found in the Earth’s crust.
  • Lead in the body is distributed to the brain, liver, kidney and bones.
  • It is stored in the teeth and bones, where it accumulates over time.
  • Human exposure is usually assessed through the measurement of lead in blood.
  • Lead in bone is released into blood during pregnancy and becomes a source of exposure to the developing foetus.
  • There is no level of exposure to lead that is known to be without harmful effects.
  • Lead exposure is preventable.
  • According to the Institute for Health Metrics and Evaluation (IHME), in 2019, lead exposure accounted for 900 000 deaths and 21.7 million years of healthy life lost (Disability-Adjusted Life Years, or DALYs) worldwide due to long-term effects on health.
  • The highest burden was in low- and middle-income countries.

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