How would a person develop those diseases that don't spread by contact with sick person?

 these diseases could be developed through the following factors :-
 * hereditary problems
 * weakness of immune system due to deficiency of nutrients
 * unhealthy habits . for example , cancer is a non-communicable disease which can happen due to smoking.
  hope this helps you !
  thumbs up plz..... :-)

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 air

blood

breast feeding

unhealthy habits(such as smoking,drinking)etc
 

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Hi!

@aks: Your friends have correctly answered your question. You may refer to their answer.

@Akshatha, safeer2m: Very good! Keep helping your friends.

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