15.3 Health Threats & Inequities
Key Takeaways
- Communicable threats spread from person to person or via vectors/vehicles; noncommunicable threats include chronic diseases and many injuries not transmitted as infections.
- Substance use disorders and harmful use of alcohol, tobacco, and other drugs are major, preventable health threats with individual and community impact.
- Environmental hazards—air, water, housing, chemicals, climate-related risks—threaten health across levels.
- Health disparities and inequities describe unjust, avoidable differences in outcomes linked to social disadvantage—not random bad luck alone.
- Mental health threats (depression, anxiety, suicide risk, trauma-related distress) are core Health content alongside physical disease.
Naming Threats Clearly
NEX Health items often ask you to classify a threat or to explain why some groups suffer worse outcomes than others. Vague worry ("germs are bad") is not enough. Use precise categories: communicable vs noncommunicable, substance-related, environmental, mental health, and the concepts of disparity and inequity.
Communicable vs Noncommunicable Threats
Communicable (Infectious) Threats
Communicable diseases can spread from person to person, or via animals/vectors (mosquitoes, ticks), or contaminated vehicles (food, water, fomites). Examples taught at intro level: influenza, COVID-19 and other respiratory viruses, tuberculosis, sexually transmitted infections, foodborne illnesses, and childhood vaccine-preventable diseases (measles, etc.).
Control strategies emphasize breaking the chain of infection: hand hygiene, vaccination, isolation/quarantine when indicated, safe food and water, vector control, and safer sex practices. Microbiology knowledge (bacteria vs viruses) supports this category but Health questions stress prevention and community impact as much as microbe names.
Noncommunicable Threats
Noncommunicable diseases (NCDs) are not transmitted as infections. Leading examples: cardiovascular disease, many cancers, type 2 diabetes, chronic respiratory disease. Unintentional injuries (falls, crashes) and many intentional injuries are also noncommunicable threats in a broad Health sense.
NCDs often develop over years and link strongly to behavior and social determinants (tobacco, diet, inactivity, excess alcohol, pollution). They dominate mortality in many high-income settings and increasingly worldwide.
| Category | Spread as infection? | Examples | Prevention flavor |
|---|---|---|---|
| Communicable | Yes (directly/indirectly) | Flu, TB, STI, measles | Vaccines, hygiene, outbreak control |
| Noncommunicable | No | Heart disease, diabetes, many cancers | Lifestyle, screening, chronic care, policy |
Exam trap: Cancer and diabetes are usually noncommunicable even though people say "it runs in families" (genetics ≠ contagion). Some infections can contribute to later cancer risk (concept-level awareness), but the cancer itself is not "caught" like a cold.
Substance Use as a Health Threat
Substance use includes tobacco, alcohol, and other drugs. Harm ranges from acute intoxication and injury to dependence (substance use disorder), overdose, liver disease, cancers, cardiovascular disease, adverse pregnancy outcomes, and infectious disease transmission via unsafe injection practices.
Community effects include impaired driving, violence, workplace injury, and strain on emergency and social systems. Stigma can block help-seeking; effective approaches combine prevention, treatment access, harm reduction concepts, and supportive environments—not shame alone.
| Substance cluster | Sample health threats |
|---|---|
| Tobacco / nicotine | Cancer, COPD, heart disease, poor wound healing |
| Alcohol (harmful use) | Liver disease, injuries, fetal alcohol spectrum risks, dependence |
| Other drugs (varies) | Overdose, infection risk, mental health comorbidity, trauma |
NEX-level expectation: recognize substance use as a major, modifiable threat at individual and population levels, and connect it to both physical and mental health.
Environmental Hazards
Environmental threats sit at the intersection of ecology and Health:
- Air pollution and indoor smoke → respiratory and cardiovascular burden
- Contaminated water → gastrointestinal and other infections; chemical toxicity
- Unsafe housing (lead paint, mold, crowding, lack of heat/cooling) → injury, infection, exacerbation of asthma
- Occupational hazards → chemicals, ergonomic injury, noise
- Climate-related extremes → heat illness, disaster injury, shifting vector ranges
- Community violence as an environmental/social hazard affecting physical and mental health
Vulnerable groups (children, older adults, outdoor workers, people in poverty) often face higher exposure. Environmental justice themes appear when hazardous sites cluster near disadvantaged neighborhoods—linking environment to inequity.
Health Disparities and Inequities
Health disparities are differences in health outcomes or opportunities between groups (by race/ethnicity, income, geography, disability, sexual orientation, rural vs urban residence, and more).
Health inequities are disparities that are systemic, avoidable, and unjust—rooted in unfair social conditions rather than solely in free individual choice or random biology. Not every difference is an inequity (for example, higher prostate cancer risk in people with prostates is biologic sex anatomy, not injustice). But when two neighborhoods have radically different asthma rates because of unequal housing quality and clinic access, that patterned gap is an inequity concern.
| Term | Meaning |
|---|---|
| Disparity | Difference in outcomes/access between groups |
| Inequity | Unfair, avoidable disparity tied to social disadvantage |
| Equality | Giving everyone the same resource |
| Equity | Allocating resources and removing barriers so groups can reach fair opportunity for health |
Nursing-entrance relevance: interpreting "why is this group sicker?" requires looking at determinants and systems, not only personal blame. Exam options that ignore access, racism as a stressor/structural barrier, poverty, or environment are often incomplete.
Mental Health Threats (Overview)
Mental health conditions are leading contributors to disability and suffering. Threats include:
- Depression and anxiety disorders — common, treatable, often under-recognized
- Suicide and suicidal ideation — urgent safety threats requiring serious response in clinical settings
- Trauma- and stress-related difficulties after violence, disaster, abuse, or medical trauma
- Severe mental illnesses (for example, psychotic disorders) — high need for ongoing care and social support
- Comorbidity with substance use and chronic physical disease
Mental health threats affect every wellness dimension and every age group. Stigma, shortage of providers, and cost create access inequities. Community protective factors include social connection, school/work supports, and timely treatment.
You are not expected to diagnose from a short stem on NEX Science; you are expected to recognize mental health as a legitimate health threat, link stress and isolation to risk, and prefer options that take psychological safety seriously.
Integrating Threat Types: A Mini Case
A rural county reports high opioid overdose deaths, rising hepatitis C linked to injection drug use (communicable consequence of substance use), limited mental health clinics (access inequity), and well-water contamination in one trailer park (environmental). One "threat" label is not enough—the exam may ask which category fits a specific bullet in the stem.
NEX Application Tips
- Ask: Can it spread as an infection? → communicable vs noncommunicable.
- Treat substance use and mental health as core threats, not footnotes.
- When group gaps look patterned and unfair, think inequity + determinants.
- Environmental hazards are Health content tied to community/population levels.
Classify first, then choose the intervention level that matches the threat described.
Which condition is best classified as a noncommunicable health threat?
Which statement best describes a health inequity?
Elevated childhood asthma rates near industrial pollution sources in a low-income neighborhood primarily illustrate which combination?