Chemical imbalances in the brain nnChemicals like neurotransmitters are responsible for the normal functioning of the brain. When there is an imbalance in these chemicals, it may contribute to the development of mental conditions such as bipolar disorder. nnGeneticsnnAnother major cause of bipolar disorders is genetics. A person has a higher risk of developing bipolar disorder if they have a family member with the condition.nnTriggersnnTriggers are stressful or life-altering situations or environments that cause extreme emotions. These situations can include a loved one's demise, the end of a relationship, living with a loved one with bipolar disorder, and abuse. Highly stressful situations or environments might affect a person so much that they develop bipolar disorder. Some experts believe that experiencing an unhealthy amount of emotional distress as a child can cause the development of bipolar disorder.