Understanding Disease: Causes, Symptoms & Types

Disease is a pathological condition impairing normal structure/function of an organism, with characteristic signs/symptoms.

Major Disease Categories

• Infectious: Bacteria, viruses, fungi, parasites (TB, COVID-19, malaria).
• Neoplastic: Cancer (uncontrolled cell growth).
• Cardiovascular: CAD, heart failure, stroke, hypertension.
• Metabolic/Endocrine: Diabetes, thyroid disorders, obesity.
• Neurological: Stroke, epilepsy, Alzheimer's, Parkinson's.
• Autoimmune: RA, lupus, MS, Type 1 diabetes.
• Genetic/Congenital: Cystic fibrosis, Down syndrome.
• Degenerative: Osteoarthritis, macular degeneration.
• Mental Health: Depression, anxiety, schizophrenia.
• Trauma/Environmental: Burns, poisoning, radiation injury.

Etiology (Causes)

• Genetic predisposition
• Infectious agents
• Environmental toxins (pollution, radiation)
• Lifestyle (diet, inactivity, smoking, alcohol)
• Immune dysregulation
• Multifactorial (most chronic diseases)

Prevention & Management

Primary prevention: vaccination, healthy diet, exercise, no tobacco, limited alcohol, safe sex, stress management. Secondary: screening (cancer, BP, lipids). Tertiary: disease management to prevent complications.

Early diagnosis improves outcomes. Consult healthcare providers for concerning symptoms.