Underlying Causes and Risk Factors of Non-Communicable Diseases (NCDs)
-communicable diseases (NCDs) are not caused by infections and are typically long-lasting and progressive in nature. The most common NCDs cardiovascular diseases, cancers, chronic respiratory diseases, and diabetes are responsible for over 70% of deaths globally. The burden of these diseases is rising especially in LMICs, driven by a complex web of underlying causes and risk factors. These causes range from individual lifestyle behaviors to deep-rooted societal, environmental, and policy-related factors.
Below are the main underlying causes and risk factors that contribute to the global and growing NCD epidemic:
1. Unhealthy Diets
One of the most significant contributors to NCDs is the shift in dietary patterns particularly the increased consumption of:
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Processed and ultra-processed foods high in added sugars, salt, unhealthy fats, and low in fiber.
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Sugary beverages, which are linked to obesity, type 2 diabetes, and dental decay.
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Red and processed meats, associated with colorectal cancer and heart disease.
Causes of Poor Diets in LMICs:
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Globalization of food markets and marketing by multinational food companies.
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Urbanization and time poverty, leading to a reliance on fast food and packaged snacks.
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Affordability: Unhealthy food is often cheaper and more accessible than fresh, nutritious options.
2. Physical Inactivity
Sedentary lifestyles are now widespread due to changes in work, transport, and recreation habits:
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Desk jobs and automation have replaced many physically demanding occupations.
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Urban transport systems favor cars and motorcycles over walking or cycling.
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Lack of recreational infrastructure (parks, gyms, safe walkways) especially in low-income areas.
Physical inactivity increases the risk of obesity, high blood pressure, type 2 diabetes, and several cancers.
3. Tobacco Use
Tobacco is a leading preventable cause of NCDs worldwide. Smoking (both active and passive) is a major risk factor for:
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Lung and throat cancers
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Chronic obstructive pulmonary disease (COPD)
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Heart disease and stroke
Specific Concerns in LMICs:
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Tobacco companies target low-income regions with aggressive marketing.
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Limited enforcement of tobacco control laws.
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Cultural normalization of smoking, especially among men in some societies.
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Emerging trend of smokeless tobacco and e-cigarettes, whose long-term risks are still under study.
4. Harmful Use of Alcohol
Excessive alcohol intake is associated with:
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Liver diseases (including cirrhosis and liver cancer)
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Cardiovascular diseases
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Certain cancers (e.g. breast, colorectal, liver)
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Mental health disorders and injuries
In many LMICs, unregulated alcohol markets, home-brewed spirits, and cultural acceptance of binge drinking contribute to the health burden.
5. Overweight and Obesity
A direct outcome of poor diet and inactivity, obesity is both a disease and a risk factor for:
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Type 2 diabetes
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Heart disease
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Joint disorders
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Many types of cancer (e.g. breast, kidney, colon)
Why Obesity Is Rising:
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Energy-dense, low-nutrient foods dominate diets.
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Reduced physical activity across all age groups.
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Marketing of unhealthy food to children and youth.
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Perceptions that body fatness equates with beauty or wealth in some cultures.
6. Air Pollution and Environmental Hazards
Environmental factors play a bigger role than often assumed, especially in urban areas:
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Outdoor air pollution (from traffic, industry, burning waste) contributes to respiratory and cardiovascular disease.
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Indoor air pollution from cooking with solid fuels (e.g. wood, charcoal, dung) in poorly ventilated homes — disproportionately affects women and children.
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Exposure to toxic chemicals in water, food, or workplaces (e.g. pesticides, heavy metals) is also a growing concern.
7. Socioeconomic and Structural Determinants
Health outcomes are shaped by where people are born, live, work, and age — collectively known as the social determinants of health. These include:
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Poverty: Limits access to healthcare, healthy food, education, and safe environments.
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Low levels of education: Reduces awareness of risk factors and ability to make informed health choices.
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Unemployment and job insecurity: Leads to stress, depression, and unhealthy coping mechanisms like substance use.
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Gender inequality: In some cultures, women have limited autonomy to make health decisions or access care.
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Health system weaknesses: Poor infrastructure, low funding, shortage of trained staff, and lack of access to essential drugs hinder prevention and early treatment of NCDs.
8. Mental Health and Chronic Stress
Psychosocial stress has a direct and indirect effect on physical health:
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Chronic stress triggers inflammatory responses in the body, raising the risk for heart disease, obesity, and diabetes.
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People under stress often turn to unhealthy coping behaviors: smoking, alcohol, overeating.
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Depression and anxiety are also risk factors for NCDs and vice versa.
Unfortunately, mental health is still under-prioritized in many LMICs.
9. Genetics and Family History
While lifestyle and environment are major contributors to NCDs, genetics also plays a role:
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A family history of hypertension, diabetes, or cancer increases one’s risk.
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Epigenetic changes (e.g. due to maternal malnutrition during pregnancy) may predispose children to metabolic diseases later in life.
However, genetic risk usually interacts with modifiable lifestyle factors. Even with high genetic risk, healthy behaviors can significantly reduce disease incidence.
10. Urbanization and Globalization
The global shift towards urban living has accelerated NCD risk factors:
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Urban areas often have less physical activity, more air pollution, and more processed food options.
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Traditional diets and lifestyles are being replaced by “Westernized” patterns.
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The global spread of multinational food and beverage companies has led to increased consumption of unhealthy products.
11. Inadequate Policies and Regulation
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Lack of food labeling laws, tobacco control measures, or sugar taxes means unhealthy products are cheap and widely accessible.
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Health systems often focus on curative rather than preventive care.
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Weak regulation allows deceptive marketing (e.g., promoting sugary cereals to children as healthy).
Summary Table: Major Risk Factors and Their NCD Links
| Risk Factor | Linked NCDs |
|---|---|
| Unhealthy diet | Heart disease, diabetes, obesity, cancer |
| Physical inactivity | Heart disease, diabetes, obesity |
| Tobacco use | Lung cancer, heart disease, stroke, COPD |
| Alcohol misuse | Liver disease, cancer, heart disease |
| Air pollution | Asthma, lung cancer, cardiovascular disease |
| Obesity | Diabetes, joint problems, cancer |
| Mental health disorders | Cardiovascular disease, substance use, poor self-care |
| Poverty / low education | All NCDs (via access and behavior pathways) |
| Genetic predisposition | Diabetes, hypertension, cancer |
Final Note
Tackling the underlying causes of NCDs requires much more than telling individuals to eat better or exercise more. It demands structural changes from health policy reform to urban planning, education, poverty reduction, and corporate regulation. The “causes of the causes” like social inequality, poor governance, and harmful commercial influences must be addressed to truly reverse the rising tide of non-communicable diseases.
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