The Beck Depression Inventory (BDI) is a 21-item, self-report rating inventory that measures characteristic attitudes and symptoms of depression). Individual questions of the BDI assess mood, pessimism, sense of failure, self-dissatisfaction, guilt, punishment, self-dislike, self-accusation, suicidal ideas, crying, irritability, social withdrawal, body image, work difficulties, insomnia , fatigue , appetite, weight loss, bodily preoccupation, and loss of libido.
If you also notice persistent anxiety or unexplained tension in yourself, our anxiety test may help.
If, instead, periods of sadness alternate with periods of unusually elevated energy or reduced need for sleep, you may also be interested in the Bipolar Spectrum Diagnostic Scale (BSDS).