Short Answers:
How many types of diseases are found?

Disease means a condition of disturbed functioning of the body or its part. 
Type of disease are:

• On the basis of duration : Acute and chronic -Example, Common cold is an acute disease. Tuberculosis is a congenital disease.

• On the basis of the time of occurrence : Congenital and Acquired - Haemophelia, Phenylketonuria are congenital diseases while Cancer, Diabetes etc are acquired diseases.

• On the basis of causal agent - infectious and non - infectious. For example Influenza, tuberculosis, pneumonia are infectious diseases. Diabetes and cancer are non-infectious diseases.