Final answer:
A 27-year-old female presenting with her first major depressive episode may suggest an underlying bipolar disorder.
Step-by-step explanation:
A 27-year-old female presenting with her first major depressive episode may suggest an underlying bipolar disorder. Bipolar disorder is characterized by episodes of depression and mania or hypomania. While a first episode may initially be a depressive episode, subsequent episodes could include symptoms of mania or hypomania.
According to research, bipolar disorder has been linked to excess mortality compared to unipolar depression. It is important to note that a proper diagnosis and treatment should be made by a qualified healthcare professional, considering additional factors such as a person's medical and psychiatric history, family history, and other diagnostic criteria.