CM
● MODULE 15 / 20
Occupational Health & Injury Prevention
Identify hazards, prioritize effective controls and build safer work and transport systems.
Quick revision ↓ Medical Dictionary
FULL CHAPTER EXPLANATION
Deep Learning — Module 15
Connect population needs and measurements to prevention, practical action and evaluation.
01
Occupational assessment
Take a work history including tasks, substances, duration, protective measures and whether symptoms change away from work. Hazards may be physical, chemical, biological, ergonomic or psychosocial. Exposure can occur through inhalation, skin contact or ingestion, and long latency may obscure occupational links. Similar illness among coworkers is a useful signal but not proof of one cause. Assess workers in formal and informal settings rather than restricting concern to large factories.
02
Hierarchy of controls
Elimination removes a hazard; substitution replaces it with a safer alternative after assessing new risks. Engineering controls separate people from exposure, such as local exhaust or machine guarding. Administrative measures alter work organization, and personal protective equipment reduces individual exposure when selected and used correctly. Higher-level controls generally depend less on constant individual behavior. Combine layers where necessary and verify their effectiveness rather than merely purchasing equipment.
03
Common hazards and surveillance
Dust may cause respiratory disease; silica and asbestos exposures require prevention and appropriate surveillance. Noise can damage hearing, and chemicals can affect multiple organ systems. Health surveillance can detect effects but is not a substitute for exposure control. Confidential results should support care and safer work rather than unjustified exclusion. Current occupational standards, reporting and compensation routes depend on jurisdiction and should be verified before case-specific advice.
04
Ergonomics and worker wellbeing
Ergonomics adapts tasks, tools and environments to human abilities, reducing strain through design, handling aids and suitable work organization. Fatigue, harassment and unsafe workload can also harm health and increase injury risk. Training supports a safer system but cannot compensate for an unguarded machine or impossible production demands. Involve workers in identifying hazards and practical improvements, and provide accessible reporting without retaliation.
05
Injury prevention systems
Injuries are often predictable and preventable. Road safety combines safe speeds, safer roads and vehicles, protective restraints and effective post-crash care. The Haddon matrix considers host, agent or vehicle and environment before, during and after an event. Preventing a crash, reducing impact injury and improving emergency response are different opportunities. Use exposure denominators and investigate near misses instead of waiting for fatal events before making changes.
High-Yield Revision
- A work history connects tasks to exposure.
- Control hazards at source before relying only on PPE.
- Health surveillance does not replace exposure prevention.
Common Exam & Concept Pitfalls
- Do not blame workers for hazards built into the system.
- Do not assume training makes unsafe equipment safe.
Sources & Further Reading
Curriculum and reference review: 24 September 2026. These original study notes summarize established principles. Use current programme schedules, local reporting requirements and clinical protocols for practice. Faculty review is pending.
- PM&DC MBBS Curriculum 2024 — Community Medicine and Public Health, printed pages 61–65
- Measurement and screening: CDC Principles of Epidemiology (archived foundational text) · WHO screening programme guide
- Services and surveillance: WHO primary health care · Pakistan NIH surveillance bulletins
- Immunization: Pakistan FDI official schedule · CDC timing and spacing principles. Apply Pakistan programme guidance to local schedules.
- Family health: WHO maternal health · Contraception · Infant feeding
- Nutrition: WHO malnutrition · Child anthropometric indices
- Environment and work: WHO drinking water · WASH · NIOSH hierarchy of controls
- Vectors and exposure: WHO dengue · Malaria prevention · Rabies · Snakebite
- Long-term health: WHO noncommunicable diseases · Mental health promotion and prevention
- Preparedness: WHO Health Emergency and Disaster Risk Management Framework
RAHBAR study structure: population need → measurement → prevention → action → evaluation. Use institutional curriculum and faculty guidance for local sequencing, practical requirements and assessment specifications.