Sydenham's chorea is a neurological disorder characterized by rapid, unintentional movements, often affecting the face, hands, and feet. It typically occurs in children and is associated with a previous infection of rheumatic fever, which is caused by a Group A Streptococcus bacteria. The condition is thought to result from an autoimmune response, where the body's immune system mistakenly attacks its own brain cells. Symptoms of Sydenham's chorea can include jerky movements, emotional changes, and difficulties with coordination. While the disorder can be distressing, it often resolves on its own over time. Treatment may involve medications to manage symptoms and reduce inflammation, helping to improve the child's quality of life.