Because of their worries, children with generalized anxiety disorder have problems paying attention and may be restless and irritable.
Doctors diagnose generalized anxiety disorder based on characteristic symptoms that have lasted 6 months or more.
Training children how to relax is often the best treatment, but sometimes a drug to reduce the anxiety is needed.

(See also Overview of Anxiety Disorders in Children and Adolescents and Generalized Anxiety Disorder in adults.)