Introduction to Community Health
Key concepts, goals, and foundational elements for anyone studying or working in public health.
1. What Is Community Health?
| Aspect |
Description |
| Definition |
The science and practice of promoting, protecting, and improving the health of groups of people who share a common geographic location, culture, or interest. |
| Scope |
Encompasses physical, mental, and social well‑being; focuses on the whole population rather than individual patients. |
| Core Principle |
Population‑based – interventions are designed to reach many people simultaneously and to address the determinants of health. |
2. Levels of Prevention
| Level |
Goal |
Typical Activities |
| Primary |
Prevent disease before it occurs |
Immunizations, health education, safe water/sanitation, tobacco‑control policies |
| Secondary |
Detect disease early & limit progression |
Screening programs (e.g., mammography, blood pressure checks), contact tracing |
| Tertiary |
Reduce complications and improve quality of life |
Rehabilitation services, chronic disease management programs, support groups |
3. Determinants of Health
| Category |
Examples |
| Biological |
Genetics, age, sex |
| Behavioral |
Diet, physical activity, substance use |
| Social |
Education, income, employment, social support |
| Environmental |
Housing quality, air/water quality, built environment |
| Health System |
Access to care, quality of services, health insurance |
Understanding these determinants helps planners target the root causes of health problems rather than just the symptoms.
4. Key Functions of Community Health Practice
- Assessment – Collect data (surveys, surveillance, focus groups) to identify health needs and assets.
- Policy Development – Translate evidence into local policies, ordinances, or programs.
- Assurance – Ensure that needed services are available, accessible, and of high quality.
- Health Promotion & Education – Design culturally appropriate messages and interventions.
- Evaluation – Measure outcomes, process indicators, and cost‑effectiveness; use findings to refine programs.
5. Common Community Health Models
| Model |
Main Idea |
Typical Use |
| PRECEDE‑PROCEED |
Starts with desired outcomes → works backward to identify determinants, then implements & evaluates. |
Comprehensive program planning. |
| Social Ecological Model |
Health is shaped by multiple layers: individual, interpersonal, community, institutional, policy. |
Designing multilevel interventions. |
| Health Belief Model |
Focuses on perceived susceptibility, severity, benefits, barriers, cues to action, and self‑efficacy. |
Tailoring health education. |
| Diffusion of Innovations |
Explains how new ideas spread through a community. |
Introducing new health technologies or practices. |
6. Data Sources & Surveillance
| Source |
What It Provides |
Example |
| Vital Statistics |
Births, deaths, cause‑of‑death data |
Mortality rates by disease |
| Disease Registries |
Incidence & prevalence of specific conditions |
Cancer registry |
| Behavioral Surveys |
Health‑related behaviors & risk factors |
BRFSS, Youth Risk Behavior Survey |
| Environmental Monitoring |
Air/water quality, housing conditions |
EPA air quality index |
| Electronic Health Records (EHRs) |
Clinical encounters, medication use |
Chronic disease management trends |
*Data must be analyzed for trends