GHE LEARNING HUB · PERSONAL CARE

Prevention

Prevention is about understanding risk, strengthening protection, acting early, and creating conditions in which people and communities can stay healthier.

PREVENT → PROTECT → ACT EARLY → IMPROVE HEALTH

SELF → FAMILY & PEERS → COMMUNITY → COUNTRY → WORLD

GHE Principle: Prevention is not about preventing everything. It is about using knowledge, evidence and collective action to reduce avoidable harm and improve health.

← Personal Care Hub Start Exploring

Illustration representing prevention and healthy living — Prevention connects knowledge, protection and action.

GHE LEARNING MOVEMENT

01 EXPLORE

→

02 LEARN

→

03 THINK

→

04 CONNECT

→

05 REFLECT

→

06 ACT

PERSONAL CARE · TOPIC 07

Prevention Connects Knowledge to Action

You have already explored how to understand your body, protect yourself, reduce hazards and recognize when screening may help. Prevention brings these ideas together and asks a bigger question:

What can we do before a problem becomes a bigger problem?

Prevention can happen before disease or injury begins, when a problem is detected early, or after a condition develops to reduce complications. It can also happen far beyond the individual — through families, schools, communities, health systems, policies and global action.

01 · WHY THIS MATTERS

Prevention Changes the Question

Instead of asking only, “How do we treat illness?”, prevention asks:

What increases risk?
What protects health?
What can be changed?
What should happen earlier?
What can communities and systems do?

CORE IDEA

Earlier action can mean less harm later.

Prevention can reduce the chance that a problem occurs, help identify some conditions earlier, or reduce complications after a condition has developed.

02 · PERSONAL HINTS

Small Actions Can Be Part of Prevention

Prevention does not require perfection. It often begins with practical, sustainable actions and knowing when to seek reliable information or support.

Know Your Risks

Learn which factors can increase or reduce the chance of illness or injury.

Strengthen Protection

Build protective habits, relationships, environments and supports.

Act Early

Do not wait for a problem to become more serious before asking a trusted adult or health professional for help.

Check the Evidence

Be cautious about health claims online. Ask where the information came from and whether credible evidence supports it.

Think Beyond Yourself

Prevention can protect other people as well as you — especially when health risks are shared.

Be Kind to Yourself

Health is influenced by many circumstances. Prevention should support people, not blame them for factors they cannot control.

03 · EXPLORE

What Does Prevention Include?

Prevention is much broader than avoiding illness. Explore the ideas that public health uses to understand and reduce risk.

Risk Factors

Characteristics, exposures, behaviours or circumstances associated with a greater likelihood of a health problem.

Protective Factors

Conditions, behaviours, relationships and resources that can support health and reduce vulnerability.

Early Action

Taking appropriate action before a problem grows or when early detection can improve outcomes.

Supportive Systems

Policies, services, environments and social conditions that make healthier choices and safer living more possible.

04 · LEARN

Three Levels of Prevention

Public health commonly describes prevention across three levels. They are related, but they answer different questions.

PRIMARY PREVENTION

Can we prevent the problem from starting?

Primary prevention aims to reduce the occurrence of disease or injury before it develops.

Examples Immunization · safer environments · health education · protective policies

SECONDARY PREVENTION

Can we identify a problem early?

Secondary prevention aims to detect disease or risk early, when appropriate action may reduce harm.

Examples Appropriate screening · early assessment · early intervention

TERTIARY PREVENTION

Can we reduce complications or disability?

Tertiary prevention focuses on reducing complications, disability or further harm after a condition has developed.

Examples Rehabilitation · complication prevention · long-term support

Important distinction:

Screening is one possible form of secondary prevention, but not every screening test is appropriate for every person. Decisions about screening depend on evidence, age, risk, benefits, harms and context.

05 · THINK SYSTEMICALLY

Prevention Is More Than Personal Choice

Individual actions matter, but people do not make health decisions in isolation. The environments around us shape what is possible.

Individual

Knowledge, skills, habits and decisions.

Family & Peers

Relationships, support, norms and shared expectations.

Community

Schools, neighbourhoods, recreation, transportation and local services.

Health Systems

Prevention, primary care, vaccination, screening and health education.

Policy

Laws, regulations, public investment and healthy public policy.

Global

International cooperation, shared threats, evidence and global health action.

06 · THINK

Prevention Requires Critical Thinking

Is every risk preventable?

No. Some risks cannot be completely eliminated. Good prevention focuses on what can reasonably be reduced, controlled or supported.

Who has the power to prevent?

Individuals are not the only actors. Families, schools, communities, governments and health systems also influence risk.

What happens when prevention becomes blame?

Blaming people can hide the social and environmental conditions that shape health. Prevention should increase opportunity, support and agency.

How do we know prevention works?

We need evidence. Strong prevention uses research, data, evaluation and attention to unintended effects.

THE PREVENTION MINDSET

RISK Understand what increases vulnerability

→

PROTECTION Strengthen protective factors

→

EARLY ACTION Act when action can make a difference

→

OUTCOME Evaluate what happened and improve

07 · CONNECT

From SELF to WORLD

Prevention becomes more powerful when we connect personal action with the systems and environments around us.

SELF

What can I do?

Learn, protect yourself, use reliable information and seek help appropriately.

→

FAMILY & PEERS

How can we support one another?

Share accurate information, encourage safety and create supportive relationships.

→

COMMUNITY

What can we improve together?

Safer schools, healthier environments, accessible services and inclusive communities.

→

COUNTRY

What should systems do?

Build policies, services and environments that make prevention possible and equitable.

→

WORLD

What can we prevent together?

Work across borders on shared health threats, knowledge, equity and sustainable development.

08 · HEALTH EQUITY

Prevention Begins Before the Clinic

Where people live, learn, work and grow can shape their opportunities for health. Prevention therefore requires attention to the social determinants of health.

Education

Access to learning and health literacy can influence opportunities and decisions.

Housing & Safety

Safe homes and neighbourhoods can reduce exposure to preventable hazards.

Food & Nutrition

Access to nutritious food is shaped by availability, affordability and environment.

Environment

Air, water, climate and the built environment influence health risks and opportunities.

Healthcare Access

Prevention depends partly on whether people can access appropriate health services.

Equity

Prevention should reduce unfair and avoidable differences in health.

GHE Equity Lens

If a prevention strategy works only for people who already have resources, information and access, we should ask whether it is truly equitable.

PREVENTION & THE SDGs

Prevention Is a Global Goal

Prevention contributes to several Sustainable Development Goals because health is connected to education, equity, environment, cities and international cooperation.

SDG 3 Good Health & Well-being

Prevent disease, promote health and improve access to appropriate services.

SDG 4 Quality Education

Health literacy and education strengthen people's ability to make informed decisions.

SDG 10 Reduced Inequalities

Prevention should address unfair differences in health opportunities and outcomes.

SDG 11 Sustainable Cities & Communities

Safe, inclusive and healthy environments are important prevention tools.

SDG 13 Climate Action

Climate action can reduce environmental risks that affect human health.

SDG 17 Partnerships

Prevention increasingly requires collaboration across sectors, disciplines and countries.

09 · EVIDENCE & LEADERSHIP

Good Prevention Needs Good Evidence

A prevention idea may sound convincing and still be ineffective. Evidence helps us distinguish promising action from unsupported claims.

01 ASK

What problem are we trying to prevent?

02 UNDERSTAND

What causes or increases the risk?

03 CHECK

What does credible evidence show?

04 ACT

Which intervention is appropriate?

05 EVALUATE

Did it work, for whom and under what conditions?

GHE

YOUNG HEALTH LEADERS

Young people can become prevention leaders.

Leadership does not mean having all the answers. It means asking good questions, checking evidence, listening to communities, identifying practical solutions and helping turn knowledge into responsible action.

10 · REFLECT → ACT

Your Prevention Challenge

Choose one health issue that matters to you. Think like a young public-health investigator.

Identify

What health problem would you like to prevent?

Investigate

What are the risk and protective factors?

Connect

Who else influences this problem?

Act

What realistic, evidence-informed action could make a difference?

Remember:

You do not have to solve a global health problem by yourself. A responsible first step is often to learn, ask questions, involve trusted people, and identify what can realistically be changed.

REFERENCES & ADDITIONAL RESOURCES

Go Further: Learn Prevention from Trusted Sources

GHE connects young learners with authoritative institutions and open educational resources. These resources can help you explore prevention from scientific, public-health, Canadian and global perspectives.

Global Public Health

WHO Health Promotion

Explore health promotion, healthier environments, policy and multisectoral action.

Explore WHO → WHO Social Determinants of Health

Learn how social, economic, environmental and political conditions shape health.

Explore WHO →

Evidence & Practical Prevention

CDC Preventing Chronic Diseases

Practical evidence-based prevention strategies and preventive care.

Explore CDC → NIH Disease Prevention Toolkit

Evidence-based information on screening, vaccines, infection prevention and other protective strategies.

Explore NIH → HARVARD Preventative Care

Public-health research and evidence on prevention, screening and health promotion.

Explore Harvard →

Canadian Public Health

CANADA Health Canada — Healthy Living

Canadian resources covering children and adolescents, healthy eating, physical activity, mental health, oral health and other prevention topics.

Explore Canada.ca → U OF T What Is Public Health?

An accessible introduction to population health, disease and injury prevention, education, policy and research.

Explore U of T → U OF T Health Promotion

Explore health promotion through social determinants, community development, advocacy, policy and evidence.

Explore U of T →

Learn More with NextGenU

NGU

NEXTGENU

Promotion and Prevention in Public Health

This course introduces the population approach to prevention, health promotion, social and cultural determinants, policy settings, and evaluation.

Population Prevention Health Promotion Social Determinants Policy Evaluation

Explore NextGenU Course →

GHE Resource Principle

Use trusted resources to learn — but keep asking questions. A reliable source should help you understand the evidence, not simply tell you what to think.

PERSONAL CARE · KEEP EXPLORING

Prevention Starts with Understanding.

Learn what matters, question what you hear, protect yourself and others, and help build healthier communities.

← Personal Care Hub Explore Health Literacy →