Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 5th

Causes of Disease

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We know that, diseases can be caused by two factors:

Internal factors in our body such as:

  • Hormonal imbalance
  • Allergic Reaction
  • Genetic disorder
  • Malfunctioning of body organs

External factors such as:

  • Unhealthy diet
  • Disease causing germs (bacteria, viruses, fungi)
  • Pollution in the environment
  • Unhealthy lifestyle

Based on the following there are two broad categories of causes of diseases –

1. Immediate Causes and Contributory Causes:

Immediate causes: These are the actual causes that are responsible for a disease. These causes can be infectious as well as non-infectious.

Example: Bacteria, Fungi, Viruses, Germs, etc.

Contributory causes: These are not the direct causes but factors that contribute in causing a disease.

Example: Poor diet, Unhealthy lifestyle, Polluted environment etc.

2. Congenital and Acquired Diseases

Congenital diseases are present since birth. For eg hole in heart of an infant. Acquired Diseases occur after birth. Based on their ability to spread from one individual to another, Acquired diseases are of two types - Infectious and Non-infectious.

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Shaalaa.com | Disease-Signs & Symptoms; Acute vs. Chronic


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