The PHQ-9 (Patient Health Questionnaire-9) is a short, validated screening tool used to assess symptoms of depression. It includes nine questions that ask how often you’ve experienced certain thoughts or feelings over the past two weeks, such as low mood, changes in sleep, or loss of interest in activities. It helps clinicians understand the severity of depressive symptoms, monitor changes over time, and guide decisions about the most appropriate support or treatment. It is not a diagnosis on its own, but an important part of good clinical care.
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