Quote from kNocturn;335286:
What's GAD?
Generalized anxiety disorder
Generalized anxiety disorder (GAD) is a common condition. Genes may play a role. Stressful life situations or learned behavior may also contribute to the development of GAD.
The disorder may start at any time in life, including childhood. Most people with the disorder report that they have been anxious for as long as they can remember. GAD occurs somewhat more often in women than in men.
Symptoms
The main symptom is the almost constant presence of worry or tension, even when there is little or no cause. Worries seem to float from one problem to another, such as family or relationship problems, work issues, money, health, and other problems.
Even when aware that their worries or fears are stronger than needed, a person with GAD still has difficulty controlling them.
Other symptoms include:
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Difficulty concentrating
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Fatigue
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Irritability
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Problems falling or staying asleep, and sleep that is often restless and unsatisfying
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Restlessness or feeling keyed up or "on the edge," often becoming startled very easily
Along with the worries and anxieties, a number of physical symptoms may also be present, including muscle tension (shakiness, headaches).
Depression and substance abuse may occur with an anxiety disorder.
http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001915
It's not as potent as other disorders