Self-test questions for depression do not determine depression, but they can assess the degree of depression. Self-test questions do not confirm depression because of the varying levels of understanding among the general public and the many causes of depression. Personality disorders are caused by interpersonal problems that lead to depression, which is different from traditional depression. Some depression is caused by medication, and not major depression, persistent depression, etc., as the general public believes. Some depression is due to physical causes, such as thyroid problems, which can lead to depression. In addition, neurological diseases, such as neurocognitive dysfunction and Parkinson’s disease, may have early symptoms that are predominantly emotional, which are not particularly well understood by the general public and cannot be diagnosed by depression self-assessment questions alone. Therefore, if the self-test questions reveal that you have been depressed in recent times, the next step should be to visit a professional outpatient clinic. Self-assessment questions can only assess the degree, but cannot determine depression.