Does dreaming of bears can cause .…..? 

The Bear is a symbol of person’s severe condition, low preoccupations, cheater, someone who looks for evil in the thing she works and someone who hides an accident inside.

The bear can also be a symbol of an enemy, crook, fool, traitor, womanizer, thief who stops the travelers and caravans in order to steal their goods.
In case you dream riding a bear you’ll get an authority/ regimen, and this is not the case then you’ll get yourself in fear and worries from which you’ll disengage later on.

And the legend says that the bear was woman first, and later on it was turned into wild animal-bear.