Non-infectious Diseases — Core Principles
Core Principles
Non-infectious diseases, also known as Non-Communicable Diseases (NCDs), are conditions that cannot be spread from person to person because they are not caused by pathogens like bacteria or viruses. Instead, they arise from a complex interplay of genetic factors, lifestyle choices, environmental exposures, and the aging process.
Key categories include genetic disorders (e.g., Hemophilia), lifestyle diseases (e.g., Type 2 Diabetes, Heart Disease, Obesity, certain Cancers), environmental diseases (e.g., Allergies, Asthma), and deficiency diseases (e.
g., Scurvy, Rickets). These diseases are typically chronic, developing slowly over time, and often require long-term management rather than a cure. Prevention largely focuses on adopting healthy lifestyles, reducing exposure to environmental risks, and early detection through screening.
Understanding the specific causes, symptoms, and general management principles for major NCDs like cancer, diabetes, and allergies is crucial for NEET aspirants.
Important Differences
vs Infectious Diseases
| Aspect | This Topic | Infectious Diseases |
|---|---|---|
| Causative Agents | Pathogenic microorganisms (bacteria, viruses, fungi, parasites) | Genetic factors, lifestyle choices, environmental exposures, physiological dysfunctions |
| Transmissibility | Transmissible from person to person (directly or indirectly) | Not transmissible from person to person |
| Onset | Often rapid onset, acute symptoms | Often slow, progressive onset, chronic symptoms |
| Examples | Common cold, flu, malaria, tuberculosis, AIDS | Cancer, diabetes, heart disease, allergies, asthma, autoimmune disorders |
| Prevention Focus | Vaccination, hygiene, sanitation, quarantine, antibiotics/antivirals | Healthy lifestyle, environmental regulation, early screening, genetic counseling |
| Immune Response | Immune system targets external pathogens | Immune system may be dysregulated (allergies, autoimmunity) or fail to detect internal threats (cancer) |