What Are The Causes Of Bipolar Disorder?
By Mark H
Bipolar disorder is a difficult illness to manage and to treat. Many who have it may ask themselves, "Why me? What caused all this?" There are great disagreements as to the causes of bipolar disorder. They all tend to go back to the old nature/nurture controversy. In other words, does a thing happen to a person because of who he or she is, or because of the environment he or she grew up in?
The nature side of bipolar disorder causes has always been seen in family histories. This, however, can be misleading. Families often pass behaviors on from one generation to the next, regardless of whether family members are natural
relatives or adopted ones.
The scientific concept of correlation without causation may account for shared histories of bipolar disorder in biologically unrelated siblings. This concept is easy to grasp. For example, a man could state that all summer, every time he got a sunburn he ate fish. So, did the sunburn cause the man to eat fish? No, but the act of fishing both caused the man's skin to burn and allowed him to catch a fish, which he then ate. In a similar way, bipolar disorder can occur in families without anything in one family member's bipolar disorder causing the bipolar disorder of another.
Also, for whatever reason, people with bipolar disorder are often drawn to each other. In this case it is unclear whether the families formed come together because of their shared genetically similar predisposition towards bipolar disorder, or whether some members of the families are genetically more prone to bipolar disorder but the illness of some other members of the family becomes exaggerated more than it would in another environment.
Research into the genetic causes of bipolar disorder is often done using twin studies. It is assumed that twins will have environments that are as close as is possible. Identical twins are used to show the effects of genetics, since they will share the same genetic materials. Fraternal twins are used as a control group. While these twins share nearly identical environments with their twins, the fraternal twins have less genetic material in common.
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