The document discusses medically unexplained symptoms and provides a history and overview of concepts related to somatoform disorders. It summarizes key terms and concepts that have been used over time, such as hysteria and hypochondriasis. Functional somatic syndromes and changes in diagnostic criteria from DSM-IV to DSM-5 are summarized. Specific somatic symptom and related disorders like somatic symptom disorder and illness anxiety disorder are briefly described. Etiology, assessment, treatment including CBT and pharmacotherapy, and factitious disorder are highlighted at a high level.