INTRODUCTION
According t W.H.O (World Health Organization), "Health" means a state of physical, mental and social well-being . It is dependent on one's physical surroundings and economic status. On the other hand, a "disease" is a disorder or disorder or discomfort or departure from "health". This can be due to lack of well-being of either the body or mind or society.
Since disease is a "discomfort" or a disorder, there can be several causes for this uncomfortable condition viz. infection by a virus or bacteria or worm, etc., or malnutrition or poor or bacteria or worm, etc or malnutrition or poor sanitation or genetic or metabolic defects, etc.
Therefore, human diseases can be broadly classified into (a) Congenital Diseases and (b) Acquired diseases.
(a) Congenital Diseases are present right from birth because of errors in metabolism or developmental process or genes, etc. and,
(b) Acquired Diseases develop after birth, i.e., these diseases develop after birth, i.e., these diseases can be acquired after birth. they are further sub-divided into:
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