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A chronic disease persistent or recurring disease, usually affecting a person for three months or longer. It is generally one that is hereditary or one that is the result of factors such as poor diet and living conditions, using tobacco or other harmful substances, or a sedentary lifestyle. Such a disease is not typically contracted from another person by contagion, because most chronic illnesses are not caused by infection.
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Disease which last for long time or throught the life and have drastic long term effect on health is termed as cronic disease. 
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