What is a key symptom of postpartum depression?

A key symptom of postpartum depression is persistent feelings of sadness and a lack of interest in daily activities. This particular symptom encapsulates the essence of depression itself, characterized by an enduring low mood that affects a person's ability to engage in and enjoy life. In the context of postpartum depression, this can manifest in a new mother feeling overwhelmed, hopeless, or detached from her baby and family, which can significantly impact her well-being and ability to care for herself and her newborn.

Other symptoms of postpartum depression may include anxiety, changes in sleep patterns, and feelings of inadequacy as a mother. While increased appetite and frequent crying spells can occur in depression, they are not as definitive or specific to postpartum depression as the persistent sadness and lack of interest. Extreme euphoria typically refers to conditions such as mania or hypomania, which are not characteristic of postpartum depression. Thus, the hallmark symptom of ongoing sadness and disinterest is crucial in identifying and diagnosing this condition in new mothers.