Subjective units of distress scale
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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.
Early Life 
There is no hard and fast rule by which a patient can self assign a SUDS rating to his or her disturbance or distress, hence the name subjective.
Some guidelines are:
- The intensity recorded must be as it is experienced now.
- Constriction or congestion or tensing of body parts indicates a higher SUDS than that reported.
The scale 
Here is one version of the scale:
10 = Feels unbearably bad, beside yourself, out of control as in a nervous breakdown, overwhelmed, at the end of your rope. You may feel so upset that you don't want to talk because you can't imagine how anyone could possibly understand your agitation.
9 = Feeling desperate. What most people call a 10 is actually a 9. Feeling extremely freaked out to the point that it almost feels unbearable and you are getting scared of what you might do. Feeling very, very bad, losing control of your emotions.
8 = Freaking out. The beginning of alienation.
7 = Starting to freak out, on the edge of some definitely bad feelings. You can maintain control with difficulty.
6 = Feeling bad to the point that you begin to think something ought to be done about the way you feel.
5 = Moderately upset, uncomfortable. Unpleasant feelings are still manageable with some effort.
4 = Somewhat upset to the point that you cannot easily ignore an unpleasant thought. You can handle it OK but don't feel good.
3 = Mildly upset. Worried, bothered to the point that you notice it.
2 = A little bit upset, but not noticeable unless you took care to pay attention to your feelings and then realize, "yes" there is something bothering me.
1 = No acute distress and feeling basically good. If you took special effort you might feel something unpleasant but not much.
0 = Peace, serenity, total relief. No more anxiety of any kind about any particular issue.
Utility does not require precision 
In using SUDS in a therapeutic setting, the therapist does not necessarily define the scale, because one of the benefits of asking a patient or client for a SUDS score is that it is simple. Typically, you can ask the client, "On a scale of one to ten, where one is the best you can feel and ten is the worst, how do you feel right now?"
The purpose of this question is to enable the patient or client to notice improvements, and the inherent difference between one person's subjective scale and another person's is irrelevant to therapy with either individual. Our brains are sophisticated enough that they can usually summarize a large amount of data very quickly, and often accurately.
There is a possibility that in some forms of therapy, the patient will want to see progress and will therefore report progress that isn't objectively present—a type one error from a statistical point of view. While both type I and type II errors are important in research situations, type one errors can have a therapeutic utility in clinical situations, in which they can provide an indirect opportunity for positive autosuggestion—much like the indirect suggestions employed in Ericksonian hypnosis.
Thus, since the main use of SUDS is for clinical purposes, rather than research purposes, the imprecise nature of the scale is relatively unimportant to its main users: patients and clinicians.