The sds is an acronym for Self-Depression Scale, which consists of 20 items rated on a 4-point scale. The scale is able to visualize the subjective feelings of depressed patients and their changes in treatment, and is mainly applicable to adults with depressive symptoms. It is not effective for patients with low levels of intelligence and low levels of literacy. The scale is divided into 4 levels, if the score is below 53 it is normal, 53-62 is mild depression, 63-72 is moderate depression, and 73 or more is severe depression. Doctors will give patients the appropriate treatment plan according to the scale score, generally moderate and severe patients will need to apply drugs, with psychological and physical therapy integrated treatment.