Diagnosing and Managing Comorbid Mental Health Conditions

Diagnostic Considerations

The American College of Oncology recommends that MDD and GAD are distinct clinical entities with specific diagnostic criteria that can coexist with adjustment disorder when full criteria for each condition are independently met 1
The most common depressive disorders among patients are major depression and adjustment disorder, which can occur simultaneously when diagnostic criteria for both are fulfilled 1
Major Depressive Disorder requires specific symptom criteria including depressed mood and/or anhedonia plus additional symptoms like sleep disturbance, fatigue, and concentration difficulties 1
Symptoms of MDD must cause clinically significant distress or impairment in functioning 1
Depression and anxiety commonly co-occur, with approximately 31% of patients with an anxiety disorder also having MDD 1

The American College of Oncology suggests using standardized assessment tools to evaluate symptom severity, such as PHQ-9 for depressive symptoms 4 and GAD-7 for anxiety symptoms 2
GAD-7 scores ≥ 10 suggest moderate anxiety, while scores ≥ 15 indicate severe anxiety 2
Pharmacotherapy may be indicated when full criteria for MDD or GAD are met 1
For anxiety symptoms, SSRIs may be preferred due to their favorable side effect profile 6
When multiple diagnoses are present, treatment should prioritize the condition causing the greatest functional impairment 1
The National Comprehensive Cancer Network recommends that when multiple diagnoses coexist, treatment should address all conditions with appropriate interventions 5