What are three factors that cause noncommunicable diseases?

nothing causes them. you cause any disease given to you. truly, your the reasoning behind any sickness, illness, or disease that you "catch" or receive. some diseases are contagious, many are not. if you catch a contagious sickness its not your fault, but otherwise it is. this is still partly your fault for hanging around sick or ill people. if your child or parent, gets a contagious sickness, its their fault and no one elses. they are responsible for what ever happens to them.