Does the apple fall far from the tree? Commentary on Hafeman et al., early indicators of bipolar risk in preschool offspring of parents with bipolar disorder.

Comorbid externalizing and internalizing disorders are common in offspring of a parent with bipolar I or II disorder. In some cases, the symptoms are harbingers of future bipolar spectrum disorder. Even when they are not, they are likely to be impairing to the child. Clinicians need to be better informed about how the history leading up to mania/hypomania unfolds, and what comorbid disorders are impairing in and of themselves. More information is needed about the parents' psychopathology, course of illness and response to treatment. Until we have data on how to prevent bipolar disorder, the best course of action is to treat the child's current impairing symptoms and render the parent as asymptomatic as possible.