When a person is affected by a disease either the normal functioning or the appearance of one or more systems of the body changes for the worse. These changes give rise to signs of the disease called symptoms. On the basis of the symptoms the physicians look for the signs of a particular disease and conduct tests to confirm the disease (Watch Human Diseases Video to learn more). The factors, which affect human health and cause disease, can be dividing into two categories:
- Intrinsic or Internal Factors.
- Extrinsic or External Factors.
The factors such as malfunctioning of the body parts, hormonal imbalances, malfunctioning of immune system and genetic disorders, which exist within the human body, are called Intrinsic Factors. The disease caused by intrinsic factors is called organic diseases or metabolic diseases. Some examples of diseases caused by extrinsic factors are: Heart attack, Kidney failure, Cataract, Diabetes etc. The disease caused by intrinsic factors can be cured by proper medical treatment.
The factors, such as malnutrition, disease causing microorganisms, environmental pollutants use of tobacco, alcohol and narcotics, which exist outside the human body, are called Extrinsic Factors. Some examples of disease caused by extrinsic factors are Kwashiorkor, Goitre, Malaria, Cholera, Tetanus etc.
Infectious diseases (Communicable diseases) : These are diseases which spread from an infected person to a healthy person through air, water, food, vectors, physical contact or sexual contact. Eg :- common cold, chicken pox, mumps, measles, typhoid, cholera, tuberculosis, malaria, AIDS etc.
Non-infectious diseases (Non-communicable diseases) :- These are diseases which are not spread from an infected person to a healthy person. Eg :- beriberi, rickets, scurvy, night blindness, diabetes, cancer, high blood pressure etc.
Human Diseases Video
Useful for CBSE, ICSE, NCERT & International Students
Grade : 9
Subject : Biology
Lesson : Why Do We Fall Ill?
Topic: Human Diseases Video
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