Diagnosis. Patients with symptoms of psychosocial disorders or other mental illness should undergo a thorough physical examination and patient history to rule out an organic cause for the illness (such as a neurological disorder).ecause of the diversity of types of mental disorders influenced by psychosocial factors, and the complexity of diagnosis and treatment, the prognosis for psychosocial disorders is highly variable. In some cases, they can be effectively managed with therapy and/or medication.