Generalized anxiety disorder (or GAD) is characterized by excessive, exaggerated anxiety and worry about everyday life events with no obvious reasons for worry. People with symptoms of generalized anxiety disorder tend to always expect disaster and can't stop worrying about health, money, family, work, or school. In people with GAD, the worry is often unrealistic or out of proportion for the situation. Daily life becomes a constant state of worry, fear, and dread. Eventually, the anxiety so dominates the person's thinking that it interferes with daily functioning, including work, school, social activities, and relationships.
In addition, people with GAD often have other anxiety disorders (such as panic disorder or phobias), obsessive-compulsive disorder, clinical depression, or additional problems with drug or alcohol misuse.
What Causes GAD?
The exact cause of GAD is not fully known, but a number of factors -- including genetics, brain chemistry, and environmental stresses -- appear to contribute to its development.
Genetics: Some research suggests that family history plays a part in increasing the likelihood that a person will develop GAD. This means that the tendency to develop GAD may be passed on in families.
Brain chemistry: GAD has been associated with abnormal functioning of certain nerve cell pathways that connect particular brain regions involved in thinking and emotion. These nerve cell connections depend on chemicals called neurotransmitters that transmit information from one nerve cell to the next. If the pathways that connect particular brain regions do not run efficiently, problems related to mood or anxiety may result. Medicines, psychotherapies, or other treatments that are thought to "tweak" these neurotransmitters may improve the signaling between circuits and help to improve symptoms related to anxiety or depression.
Environmental factors: Trauma and stressful events, such as abuse, the death of a loved one, divorce, changing jobs or schools, may contribute to GAD. GAD also may become worse during periods of stress. The use of and withdrawal from addictive substances, including alcohol, caffeine, and nicotine, can also worsen anxiety.