Below are the event which could cause bipolar
Both environmental and genetic factors play a role.

Environmental risk factors include a history of childhood abuse (sexually abused as a child via rape, child molest, abused by pedophile etc), and long-term stress.

About 85% of the risk is attributed to genetics (bipolar can be inherited via gens).

The other fact is that Bipolar is spread through inherited genetics, and when two people join themselves and one of them having bipolar, some of the traits of Bipolar can be shared through sexual intercourse – so to say; the decisions that the spouse makes which are bipolar influenced, can also affect and influence the partner due to the intmate relationship that they have…

A lifestyle of a child that grew up entertaining narcissistic behaviours can lead to bipolar in a grown up age.

If a child in his child hood or teenager age was not taught on how to make the right moral decisions (teaching a child on how to know the difference between immorality and morality, wrong or right) , this could lead to a lifestyle of making poor choices (selfish & narcissistic choices), which will eventually turn into bipolar.

Next article – 

Bipolar –What is Bipolar disorder?

Why is the risk of death high among bipolar patients?