A Subjective Units of Distress Scale (SUDS – also called a Subjective Units of Disturbance Scale) is a scale of 0 to 10 for measuring the subjective intensity of disturbance or distress currently experienced by an individual. The individual self assesses where they are on the scale. The SUDS may be used as a benchmark for a professional or observer to evaluate the progress of treatment. In desensitization-based therapies, such as those listed below, the patients' regular self assessments enable them to guide the clinician repeatedly as part of the therapeutic dialog.