Hypomania isn't uncommon.
As many as 40% of people with major depressive disorder may have
sub threshold hypomania, a new survey revealed. The study was part of
the National Comorbidity Survey Replication, a federally sponsored
nationally representative survey of Americans that was conducted between
February 2001 and April 2003. Subthreshold hypomania is a discrete
period of increased energy, activity, euphoria, or irritability that
does not interfere with daily activities. The subgroup of people with a
history of major depression and subthreshold hypomania were younger at
onset and had more depression episodes than did those without a history
of hypomania. In a statement, lead author Kathleen Merikangas, Ph.D., of
the National Institute of Mental Health said that recognizing hypomania
in major depression "is important in determining the future risk
for the development of bipolar disorder, and should be considered in
treatment decisions among people with major depression." The study
was published online Aug. 16 in the American Journal of Psychiatry.