The document discusses the importance of PMHNPs having a comprehensive understanding of mood disorders to properly assess, diagnose, and develop treatment plans for patients presenting with these disorders. Mood disorders are diagnosed when a patient's emotional state meets criteria for severity, impact on functioning, and duration of symptoms. Those with mood disorders may find their emotions interfere with daily life activities like work and relationships in a way that impacts daily functioning. Mood disorders can also lead to substance abuse, suicidal thoughts, or behaviors but can be managed with an effective treatment plan and understanding how to manage symptoms.