We can classify illness:

1.- According to how quickly they appear and how long they last :

                       ACUTE: appears rapidly and does not last a long time. Flu or diarrhoea are two examples. 

                     CHRONIC: appears slowly and last a long time. Allergies and diabetes are two examples. 

                     CONGENITAL:  are present from birth. Dwarfism and  haemophilia are two  examples. 

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   2.- And according to their origin:

                  2 a -  INFECTIOUS: caused by a virus or microbe. There are different types of infectious diseases depending on the agent that causes the infection:

                                       a.  BACTERIAL : caused by a bacteria ( pneumonia, tetanus, salmonella)

                                       b.  FUNGAL : caused by fungi ( athlete´s foot)

                                       c. PARASITIC: caused by protozoans (malaria)

                                        d. VIRAL: caused by a virus ( flu, chickenpox, measles, AIDs)

                2 b-  NON-INFECTIOUS: have other causes like poison, injuries or poor nutrition.             

 

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