Which condition involves a person complaining of multiple physical symptoms over a long period of time without a supporting medical diagnosis?

Somatization disorder involves a long-lasting pattern of multiple physical complaints that are not adequately explained by a medical condition. Conversion disorder typically involves a specific neurological-like symptom, while body dysmorphic disorder centers on perceived flaws in appearance; therefore, the correct choice is somatization disorder.

AI-written and checked against the verified answer.