Sign or symptoms provide information about the presence of particular disease.
Types of diseases
In acute diseases,person get better and become well within a week or so,has no bad effect on our health,do not lose much weight,become short of breath,do not feel tired all the time,may not go to school just for few days.
For Ex:Tuberculosis,diabetes,arthritis,cancer etc.
In chronic disease it is difficult for us to follow what is taught in the school,drastic effects on people’s health,Persistent feeling of tiredness,ill over the years causes weight loss.
Congenital diseases:These diseases are present since birth.They are caused due to genetic abnormality or due to metabolic disorders or malfunctioning of any order.
They are of 2 types:
1)Infectious or communicable:These diseases are caused by some biological agents or pathogens such as viruses,bacteria,protozoans,fungi etc.
They are spread from one person to another by various physical contact such as air,water,food etc.
2)Non-infectious or non-communicable:These diseases are not caused by any infectious agent.
They are restricted only to those persons who are suffering from them.
They are caused from
1)lack of certain essential substances in our diet.
2)Uncontrolled growth of tissue in any part of body
5)Degeneration of tissue