Urban Disease Patterns

Intro to Urban Disease Patterns - City Sickness Intro

• Urbanization: Population shift to cities, causing urban growth.
  • Urban Area (India): Defined by Census (Statutory/Census Towns).
• Urban Health Factors:
  • ↑ Density & overcrowding, pollution (air, water, noise).
  • Lifestyle changes (sedentary, diet patterns).
  • Social dynamics (stress, inequity, social support).
• Double Burden: Coexistence of communicable (CDs) & non-communicable (NCDs) diseases.

⭐ Census Town (India): Min. pop 5,000; ≥75% male main workers in non-agricultural pursuits; density ≥400/km².

Urban Communicable Diseases - Crowded Critters

• Prevalent Diseases:
  • Tuberculosis (TB): airborne, overcrowding.
  • Dengue & Chikungunya: Aedes mosquitoes.
  • Diarrheal Diseases (Cholera, Typhoid): contaminated water/food.
  • Acute Respiratory Infections (ARI): close contact, indoor pollution.
  • Leptospirosis: rodent urine, contaminated water.
  • Malaria: Anopheles stephensi (urban vector).
• Favorable Urban Factors:
  • High population density, slums.
  • Poor sanitation, improper waste disposal.
  • Intermittent/unsafe water supply.
  • Increased vector breeding sites.

⭐ Aedes aegypti, breeding in artificial water collections, is the primary Dengue vector in Indian cities.

Urban Non-Communicable Diseases - Lifestyle Afflictions

• Predominant NCDs: Hypertension, Diabetes Mellitus (DM), Cardiovascular Diseases (CVDs), common Cancers (e.g., lung, breast, colorectal), Obesity, COPD.
• Key Urban Risk Factors:
  • Lifestyle: Sedentary habits, unhealthy diet (processed foods, high sugar/salt/fat).
  • Stress: Chronic psychosocial stress.
  • Environment: Air & noise pollution.
  • Substances: Tobacco & alcohol use.

⭐ Urban areas in India report nearly double the prevalence of diabetes (~10-14%) and hypertension (~25-30%) compared to rural settings (diabetes ~5-8%, hypertension ~15-20%).

Urban Mental & Social Health - Concrete Jungle Blues

• Mental Health: ↑ Stress, anxiety, depression, substance abuse.
• Social Pathologies: ↑ Violence, crime, social isolation, accidents (e.g., road traffic).
• Drivers: Fast-paced life, competition, ↓ social support, overcrowding, pollution.

⭐ National Mental Health Survey (NMHS) 2015-16: Urban areas show higher prevalence of mood disorders (e.g., depression) & substance dependence compared to rural areas.

Vulnerable Urban Populations - Disparity Hotspots

• Key Groups: Slum dwellers, homeless, migrants, elderly, children, women.
• Health Issues: ↑ Communicable diseases (TB, diarrhea), NCDs, malnutrition, mental health, occupational hazards.
• Access Barriers: Poverty, illiteracy, social stigma, overcrowding, limited services, insecure housing.
• Health Inequity: Unequal social determinants (water, sanitation, housing) cause health outcome disparities.

  ⭐ In India, Infant Mortality Rate (IMR) in urban slums can be 2-3 times higher than in non-slum urban areas.

Urban Disease Control Strategies - City Shield Strategies

• Multi-sectoral Approach: Coordinated efforts across health, sanitation, housing, transport, and environment sectors.
• Key Interventions: Improved water & sanitation, solid waste management, integrated vector control, health promotion & BCC (Behavior Change Communication).
• NUHM Role: Strengthens urban primary healthcare via U-PHCs (Urban Primary Health Centres), U-CHCs (Urban Community Health Centres); community participation through Mahila Arogya Samitis & USHAs.

![Dynamic Networks and Changing Contexts in Urban Health](https://ylbwdadhbcjolwylidja.supabase.co/storage/v1/object/public/notes/L1/Community_Medicine_Urban_Health_Urban_Disease_Patterns/bc6cfdc4-e157-4889-913e-ed722c0f65b7.jpg)
> ⭐ USHA (Urban Social Health Activist) is a key community link under NUHM, similar to ASHA in rural areas, facilitating access to health services for the urban poor and vulnerable populations.

High‑Yield Points - ⚡ Biggest Takeaways

• Urban India faces a dual disease burden: prevalent NCDs (diabetes, HTN, CVDs) and persistent CDs (TB, dengue).
• Lifestyle factors like sedentary habits and poor diet fuel the NCD surge.
• Air pollution significantly contributes to ↑ respiratory illnesses (asthma, COPD).
• Mental health issues (stress, depression) show increased urban prevalence.
• Road Traffic Accidents (RTAs) are a major cause of urban injury and death.
• Health inequities persist, with slums vulnerable to vector-borne and water-borne diseases.