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Understanding Environmental Health
Environmental conditions are illnesses or injuries caused or worsened by physical, chemical, or biological factors in the environment. Heat-related illness (heat exhaustion, heat stroke) results from failed thermoregulation in hot settings; cold injury (hypothermia, frostbite) from prolonged cold exposure. Dehydration and sunburn are common in outdoor and occupational settings. Carbon monoxide (CO) poisoning is a leading cause of unintentional poisoning; altitude illness affects people ascending to high altitude. Drowning and near-drowning are environmental emergencies. Bites and stings (insects, snakes, marine life) and plant dermatitis (e.g. poison ivy) are also managed as environmental presentations.
Assessment focuses on exposure history, vital signs (core temp when relevant), and targeted investigations (e.g. carboxyhaemoglobin for CO, electrolytes for heat illness). First aid and removal from exposure are key; heat stroke and severe hypothermia require urgent cooling or rewarming. Early recognition and evidence-based management improve outcomes.
This hub links to evidence-based overviews of environmental conditions with symptoms, diagnosis, and treatment pathways.
Key Components
- Heat & cold exposure
- Toxins (CO, chemicals)
- Altitude, pressure
- Water (drowning)
- Bites, stings, plants
Warning Signs
- Altered mental status (heat stroke, CO)
- Severe shivering or none (hypothermia)
- Respiratory distress (drowning, anaphylaxis)
- Headache, nausea (CO, altitude)
- Skin changes (frostbite, burns)
💡 Clinical Pearl
Heat stroke is a medical emergency—rapid cooling saves lives. For CO poisoning, high-flow oxygen and consider hyperbaric oxygen in selected cases. In hypothermia, handle gently to avoid ventricular fibrillation; active rewarming per guidelines. For snake bite, immobilise and seek antivenom; do not cut or suck the wound.
Major Risk Factors
- Extreme temperatures, outdoor work
- Poor ventilation (CO)
- Rapid ascent to altitude
- Alcohol, certain medications
- Young or older age
🛡️ Prevention
Core strategies:
- ✓ Hydration, shade, and rest in heat
- ✓ Layered clothing and shelter in cold
- ✓ CO detectors and vented appliances
- ✓ Gradual ascent at altitude
- ✓ Sun protection, water safety
Environmental Conditions (A–Z)
Evidence-based information on environmental and occupational health conditions
All Environmental Conditions
Select a condition for overview, symptoms, diagnosis, and treatment.
Heat Exhaustion
Heat illness, mild
Heat Stroke
Severe hyperthermia
Hypothermia
Low body temperature
Frostbite
Cold tissue injury
Dehydration
Fluid deficit
Sunburn
UV skin damage
Carbon Monoxide Poisoning
CO toxicity
Altitude Sickness
Acute mountain sickness
Near-Drowning
Submersion injury
Insect Stings
Bees, wasps, ants
Snake Bite
Envenomation
Poison Ivy
Contact dermatitis
▶ 📖 References
- World Health Organization (WHO). Environmental health. Accessed February 2026.
- Centers for Disease Control and Prevention (CDC). National Center for Environmental Health. US.
- National Institute for Health and Care Excellence (NICE). Environmental conditions. UK.
- Wilderness Medical Society. Practice guidelines (heat, cold, altitude, drowning). Accessed February 2026.
- American College of Medical Toxicology (ACMT). Toxicology resources. Poisoning and envenomation.
- Health and Safety Executive (HSE). Occupational health. UK.
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This content is for educational purposes only. Clinical decisions should be made in consultation with qualified healthcare professionals.