I have read that according to Derek Wood at Mental-Health-Matters.com, "Bipolar Disorder can be associated with low serotonin levels, which has been implicated in impulsivity, which...makes a person more prone to lie."

I have also read that the lies that are told as a result of the bipolar condition vary on a case-by-case basis. Some lies are harmless and others can be devastating.

Is it the illness or is it the person's character that causes loss of control and to tell lies ?