why do we fall ill class 9 pdf

1. БHealthБ
is a state of being well enough to function well physically, mentally, and socially. 2. БDiseaseБ ( disturbed ease) means being uncomfortable. One or more systems of the body will change, give rise to БSymptomsБ ( Cough, loose motions, pus formation, headache, fever, breathlessness, vomiting, fits, unconsciousness, inflammation, swelling and general effects - a Doctor look for the basis of symptoms). Diseases are basically two types- Acute Disease & Chronic Disease 3. Acute Disease: The disease which lasts for only a short period of time is called Acute Disease Ex. Common Cold. 4. Chronic Disease: The disease which lasts for long period of time is called Chronic Disease Ex. Tuberculosis. 5.


Causes of Diseases : Most of the diseases have many causes, rather than one single cause, like unclean water, nourishment, genetic differences, genetic abnormalities e. g. Based on the causes diseases are of two types: Non-Infectious Diseases and Infectious Diseases. 6. Non-Infectious Diseases: Not caused by infectious agents, mostly internal and non- infectious cause. Ex. Cancer 7. Infectious Diseases: Caused by infectious agents. (Please refer Fig. 13. 1 (a-e), NCERT Text Book Page- 181). a)The infectious diseases spread by agents are called as Communicable Diseases. Introduction Health is a state of being well enough to function well physically, mentally and socially. Disease: Any disturbance in the structure or function of any organ or part of body.


The various causes of diseases are pathogens (virus, bacteria), lack of nutritious diet/balanced diet and lack of public health services. Acute diseases occur suddenly and lasts for a short duration while chronic diseases develop slowly and lasts for long period of time. The diseases/infections can be prevented by life style (exercise, proper sleep, enough relaxation) modification, taking balanced diet, good personal health and hygiene and also maintaining a clean and healthy surrounding. Treatment involves killing of the microbes/pathogens. Health is a state of physical, mental and social well-being. (i) Good physical and social environment. (ii) Good economic conditions.


Good physical and social environment includes clean surroundings, good sanitation, proper garbage disposal and clean drinking water. Good economic conditions includes job opportunities for earning to have nutritious food and to lead a healthy life. Community Health All those activities which people do both individually and in groups for the development of their society, constitute the community health. Personal and community health are supplementary to each other. We protect ourselves by keeping our body clean. For this, we also require a good and healthy environment in our surroundings. We can have this only by the means of community health and development. So, both personal and community health are inter-related.

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