Health promotion and prevention
Population health looks beyond individual patients to the health of whole communities. Prevention is its most powerful tool. For study only, not clinical guidance: always follow your programme, current local protocols, and supervising clinicians.
What population health is
Population health focuses on health outcomes across groups of people and the factors that shape them. Instead of only treating illness one patient at a time, it asks why some communities are healthier than others and how to improve health for everyone.
Levels of prevention
Primary prevention stops disease before it starts (vaccination, healthy eating, seat belts). Secondary prevention detects disease early to limit harm (screening for cancer or high blood pressure). Tertiary prevention reduces complications of established disease (rehabilitation after stroke, diabetes foot care).
Health promotion
Health promotion enables people to increase control over their health, through education, supportive environments, and healthy public policy. The WHO's 1986 Ottawa Charter for Health Promotion identified building healthy public policy, creating supportive environments, strengthening community action, developing personal skills, and reorienting health services.
Screening programmes
Screening tests look for disease in people without symptoms. Examples include blood pressure checks, cervical cancer screening, mammography, colorectal cancer screening, and newborn screening. Good screening programmes target serious conditions, use acceptable tests, and offer effective treatment when disease is found.
Vaccination and herd immunity
Vaccination is one of the most effective public health measures. When enough people are immune, transmission falls and those who cannot be vaccinated are protected: herd immunity. The threshold depends on how contagious a disease is; for measles, roughly 95% coverage is needed.
Behaviour change
Changing health behaviours is hard. Models such as the transtheoretical (stages of change) model describe stages: precontemplation, contemplation, preparation, action, and maintenance. Motivational interviewing, a collaborative conversation style, helps people find their own reasons to change.
Healthy People
In the US, the Healthy People initiative sets national health objectives every decade; Healthy People 2030 focuses on eliminating health disparities, achieving health equity, and improving health literacy. It provides data-driven targets for communities and health systems.
Worked example
A community nurse plans a diabetes programme. Primary prevention: cooking classes and walking groups to prevent type 2 diabetes. Secondary prevention: glucose screening events for at-risk adults. Tertiary prevention: foot care clinics and education for people with diabetes to prevent ulcers and amputations.
Key takeaways
Population health addresses health across groups and its causes. Primary prevention stops disease, secondary detects it early, and tertiary limits complications. The Ottawa Charter frames health promotion. Screening must target serious, treatable conditions. Vaccination provides herd immunity; measles needs about 95% coverage. Stages of change and motivational interviewing support behaviour change. Healthy People 2030 sets US objectives.
Flashcard
Health outcomes of groups
Check your understanding
A mammogram for a woman with no symptoms is an example of: