Was Bipolar caused by a Polar Bear? This was by my eight year old niece but I thought it was too cute not to share. Her mother and I were discussing it and I guess she was listening and was like was bipolar caused by a Polar Bear because they are cute animals. Both of my nieces know that I have health issues to various degrees but I don't think they firmly understand which is a good thing because I don't quite want to ruin their childhood.