Why do we fall ill?

1. Acute disease

1.1. Ex+headache and common cold.

2. Chronic disease

2.1. Ex+ elephantiasis and tuberculosis

3. Causes of disease

3.1. Immediate cause

3.1.1. Ex-virus,bacteria and protozoa

3.2. Contributory cause

3.2.1. Ex- dirty water and unhealthy surrounding

4. Infectious disease

4.1. Non infectious disease

4.1.1. Ex-cancer,genetic and abnormalities

4.2. Ex-malaria,cholera and food paisoning