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Why Do We Fall Ill

  • Health and Disease
    • Health - A state of physical, mental, and social well-being that includes a unity and harmony within the mind, body, and soul of an organism
    • Disease - Any condition that can lead to discomfort, distress, health problems, and even death of the affected person
    • Symptoms - Indications of disease, such as headache, stomach pain, nausea, etc that can only be felt by the patient
    • Signs of a disease include fever, vomiting, diarrhoea, etc that can be observed by a physician
    • Incubation period - The time interval between infection and appearance of symptoms

Causes of diseases

  1.  Contributory causes 
    • Unhealthy condition
    •  Improper public service
    • Poverty


    2. Immediate causes:

  • These are external causes like micro-organisms.
  • Organisms like virus, bacteria, and other micro-organisms can cause diseases in a person.


On the basis of its duration , diseases are of two types- Acute and Chronic

      • Acute - Lasts for a short period of time, eg. Cold, cough, influenza, etc.
      • Chronic - Lasts for long periods of time, eg. Diabetes, kidney stones, etc.

The disease-causing microorganisms that transmit communicable diseases belong to different categories such as:

  • Viruses - These are tiny organisms that grow, multiply, or reproduce only inside the host cells.

Diseases caused by viruses - Influenza, cold (Rhinovirus), dengue, AIDS, etc.

  • Bacteria - These are unicellular organisms; larger than viruses…

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