What condition does dystonia describe?

Dystonia is a movement disorder characterized by sustained muscle contractions, twisting movements, and abnormal postures, which result from impaired muscle tone. This condition affects the ability of muscles to relax and contract properly, leading to stiffness or involuntary movements.

By understanding that dystonia involves issues with muscle control, it becomes clear that the concept of impaired muscle tone aligns directly with the characteristics of this disorder. The other options pertain to symptoms that affect the gastrointestinal system or general energy levels, rather than the musculoskeletal system or muscle functioning. Therefore, recognizing dystonia as a condition with specific impacts on muscle tone helps clarify its nature and distinguishes it from symptoms like nausea, loss of appetite, or fatigue.