Why we ignore health risks until they become impossible to overlook
In short: We often believe we know how to stay healthy, yet a massive 'knowing-doing gap' persists. While psychological models suggest we weigh risks and benefits, real-world evidence shows that visible, striking symptoms often override our complex internal belief systems entirely.
Developed in the 1950s by social psychologists at the U.S. Public Health Service—including Irwin M. Rosenstock and Howard Leventhal—the Health Belief Model (HBM) was born from a practical crisis: low tuberculosis screening rates despite available mobile X-ray services. The framework operates on an expectancy-value logic: individuals engage in health-protective behaviors based on how much they value avoiding sickness and their expectation that a specific action will prevent it.
The model relies on several psychological constructs. 'Perceived threat' is the combination of how susceptible an individual feels to a condition and how severe they believe the consequences to be. When people recognize these risks, they weigh the 'permissive' factors: the perceived benefits of action versus the perceived barriers, such as financial costs, time constraints, or lack of access. To bridge the gap between thought and action, 'cues to action'—like medical advice or media campaigns—act as necessary triggers.
However, the model's predictive power can falter when faced with undeniable physical evidence. In a study of patients with hematuria (blood in urine) in Jordan, researchers found that while 91% of participants sought care, the HBM constructs like perceived severity or barriers did not independently predict this behavior. Instead, the visibility of the symptom was the driver: patients with macroscopic (visible) blood were 2.7 times more likely to seek care than those with microscopic levels. This suggests that when a threat becomes visually striking, the complex psychological weighing of risks and benefits may be bypassed entirely.
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Sources
- Summary by Intellect · source: Behavior Change Theories and Models Within Health Belief Model Research: A Five-Decade Holistic Bibliometric Analysis
- Also: Health-seeking behavior among hematuria patients in Jordan: the case of the Health Belief Model.
- Also: Health belief model
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