CBSE Class 9 Science- Why do we fall ill? – Disease and its causes Disease and its causes The disease can be defined as a malfunctioning of the normal state of the living organism that disturbs or modifies the performance of the vital functions. There can be many reasons for diseases. Let us understand the sources of diseases. Sources of disease There are various factors, causes or sources. Let us discuss them in detail:- Intrinsic or internal factors – The diseases that occur within the human body recalled intrinsic factors. The factors which affect human health are as below:- Malfunctioning of various body parts such as heart, kidney, liver etc. Genetic disorder Hormonal imbalance Allergy-it means malfunctioning of the immune system of the body. The diseases caused by internal factors are called metabolic diseases. Few examples are Cardiac failure (heart attack) Kidney failure Osteoporosis Myopia Cataract Sickle cell anaemia Cancer Arthritis Asthma
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