Functional disorders are medical conditions where patients experience symptoms that cannot be explained by traditional medical tests or imaging. These disorders often affect bodily functions, such as movement, digestion, or mood, but do not show any clear physical abnormalities. Examples include irritable bowel syndrome and fibromyalgia. The exact cause of functional disorders is often unclear, but they may involve a combination of psychological, neurological, and environmental factors. Treatment typically focuses on managing symptoms through therapies, lifestyle changes, and sometimes medication, aiming to improve the patient's quality of life and overall well-being.