A somatic symptom disorder, formerly known as a somatoform disorder, is a category of mental disorder included in a number of diagnostic schemes of mental illness, including the Diagnostic and Statistical Manual of Mental Disorders, (latest version DSM-5) used by most mental health professionals in the United States. The diagnosis requires physical symptoms that suggest physical illness or injury – symptoms that cannot be explained fully by a general medical condition or by the direct effect of a substance, and are not attributable to another mental disorder (e.g., panic disorder). In people who have been diagnosed with a somatic symptom disorder, medical test results are either normal or do not explain the person's symptoms, and history and physical examination do not indicate the presence of a known medical condition that could cause them, though it is important to note that the DSM-5 cautions that this alone is not sufficient for diagnosis. The patient must also be excessively worried about their symptoms, and this worry must be judged to be out of proportion to the severity of the physical complaints themselves. A diagnosis of somatic symptom disorder requires that the subject have recurring somatic complaints for at least six months.