High Quality Content by WIKIPEDIA articles! Generalized anxiety disorder (GAD) is an anxiety disorder that is characterized by excessive, uncontrollable and often irrational worry about everyday things that is disproportionate to the actual source of worry. This excessive worry often interferes with daily functioning, as individuals suffering GAD typically catastrophe, anticipate disaster, and are overly concerned about everyday matters such as health issues, money, death, family problems, friend problems or work difficulties. They often exhibit a variety of physical symptoms, including fatigue, fidgeting, headaches, nausea, numbness in hands and feet, muscle tension, muscle aches, difficulty swallowing, bouts of difficulty breathing, trembling, twitching, irritability, sweating, insomnia, hot flashes, and rashes. These symptoms must be consistent and on going, persisting at least 6 months, for a formal diagnosis of GAD to be introduced. Approximately 6.8 million American adults experience GAD.