Understanding Disease: Definitions, Causes, Signs vs. Symptoms, and Prevention

Disease is a pathological condition disrupting normal structure or function, characterized by specific signs and symptoms.

Key Definitions

• Sign: Objective, observable (e.g., fever, rash, hypertension).
• Symptom: Subjective experience (e.g., pain, nausea, fatigue).
• Syndrome: Cluster of signs/symptoms consistently occurring together.

Etiologic Categories

Prevention Levels

1. Primary: Vaccination, sanitation, healthy lifestyle, chemoprophylaxis.
2. Secondary: Screening (mammogram, colonoscopy, BP), early treatment.
3. Tertiary: Rehabilitation, chronic disease management, complication prevention.
4. Primordial: Policies preventing risk factor emergence (e.g., smoke-free laws).

Treatment Principles

Etiologic (antibiotics), symptomatic (analgesics), supportive (fluids, oxygen), curative (surgery), palliative (comfort-focused). Shared decision-making and health literacy improve adherence.

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Category	Examples
Infectious	Bacteria, viruses, fungi, parasites (TB, HIV, malaria)
Genetic	Cystic fibrosis, sickle cell, Huntington's
Environmental	Toxins (asbestos, lead), radiation, heat/cold
Immune-mediated	Autoimmune (RA, SLE), immunodeficiency, allergy
Neoplastic	Benign/malignant tumors
Degenerative	Osteoarthritis, Alzheimer's
Nutritional/Metabolic	Scurvy, diabetes, obesity
Trauma	Fractures, burns, TBI