Forensic Medicine and Toxicology
Environmental and Occupational Toxicology
Environmental and occupational toxicology for MBBS: silicosis, asbestosis, byssinosis, arsenic and fluoride, industrial disasters and compensation, mapped to NMC codes FM13.1 and FM13.2.
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Environmental and Occupational Toxicology
Environmental and occupational toxicology for MBBS: silicosis, asbestosis, byssinosis, arsenic and fluoride, industrial disasters and compensation, mapped to NMC codes FM13.1 and FM13.2.
Environmental and occupational toxicology deals with poisons in the shared environment and the workplace. This chapter covers the classic occupational lung and metal diseases, environmental hazards such as arsenic and fluoride in water and industrial gas disasters, and the Indian framework for reporting and compensating occupational illness.
High-yield: Environmental and Occupational Toxicology
- Environmental toxicology studies harm from pollutants in air, water, soil and food to which whole populations are exposed.
- The Bhopal gas tragedy, a release of methyl isocyanate, is the classic example of a mass industrial chemical disaster.
- Occupational lead exposure occurs in battery making, smelting and paint work and causes anaemia, neuropathy and colic.
- Silicosis is a fibrotic lung disease from inhaling silica dust in mining, stone-cutting and sandblasting, and raises the risk of tuberculosis.
- Asbestos exposure causes asbestosis, bronchogenic carcinoma and mesothelioma, often after a long latent period.
- Byssinosis is a lung disease of cotton, flax and hemp dust exposure, classically worse on the first day back at work.
- Chronic arsenic in drinking water causes skin lesions, pigmentation and an increased risk of skin and internal cancers.
- Fluorosis from high fluoride in water causes dental mottling and, when severe, crippling skeletal fluorosis.
- Carbon monoxide from poorly ventilated heaters and vehicle exhaust is a common cause of accidental gas poisoning.
- Pesticide exposure among agricultural workers is a major source of organophosphate poisoning in India.
- The Factories Act and the Employees' State Insurance and compensation laws provide for the reporting and compensation of occupational disease.
- A notifiable occupational disease must be reported so that the workplace hazard can be controlled.
- Biological monitoring, such as blood lead levels, tracks the internal dose of a workplace toxin.
- The doctor's opinion on occupational disease links the exposure history, latency and clinical findings to support a compensation claim.
- Primary prevention through engineering controls, ventilation and protective equipment is more effective than treating established disease.
Classic occupational diseases
- **Silicosis:** Silica dust in mining and stone-cutting; nodular lung fibrosis, increased tuberculosis risk.
- **Asbestosis:** Asbestos fibres; lung fibrosis, bronchogenic carcinoma and mesothelioma after long latency.
- **Byssinosis:** Cotton, flax and hemp dust; chest tightness classically worse on the first working day.
- **Lead poisoning:** Battery and smelting work; anaemia, neuropathy and abdominal colic.
NMC competencies in this chapter
- **FM13.1:** Environmental and occupational toxic hazards
- **FM13.2:** Occupational poisoning and compensation opinions
Frequently Asked Questions
What is silicosis and why does it matter?
Silicosis is a fibrotic lung disease from inhaling silica dust in mining and stone-cutting. It is irreversible and markedly raises the risk of tuberculosis, so prevention is key.
Which diseases follow asbestos exposure?
Asbestosis, bronchogenic carcinoma and mesothelioma, often appearing decades after exposure, which makes the exposure history central to diagnosis and compensation.
How does chronic arsenic in drinking water present?
With skin pigmentation and hyperkeratosis, characteristic raindrop pigmentation, and a raised long-term risk of skin and internal cancers in affected populations.
What is the doctor's role in occupational disease?
To link the exposure history, latent period and clinical findings, to report notifiable disease, and to give an opinion supporting a worker's compensation claim under the relevant laws.
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