Theories of Disease

Theories of disease explain how and why illnesses occur. The major theories include: 1. **Germ Theory**: Suggests diseases are caused by microorganisms like bacteria and viruses. 2. **Miasma Theory**: An older belief that diseases arise from "bad air" or pollutants. 3. **Genetic Theory**: Focuses on inherited traits and mutations that can lead to diseases. 4. **Lifestyle and Environmental Factors**: Highlights how personal habits (like diet and exercise) and surrounding conditions impact health. Together, these theories help us understand the origins of diseases and guide prevention and treatment.