What exactly is generalized anxiety disorder (gad)?

Generalized Anxiety. Excessive anxiety and worry (apprehensive expectation), occurring more-days-than-not for at least 6 months, about a number of events or activities (such as work or school performance).The person finds it difficult to control the worry.The anxiety and worry are associated with three (or more) of the following 1.Restlessness easily fatigued difficulty concentrating, irritability, muscle tension.
GAD. People with GAD may be experience constant, out of control worrying. This can be expressed by the body in the form of fatigue, lightheadedness, insomnia, frequent urination, abdominal pain, lump in throat, shortness of breath, headaches and muscle tension (especially upper back & neck). There can ^'ed irritability & v'ed concentration.
See this website. On GAD http://www.mayoclinic.org/diseases-conditions/generalized-anxiety-disorder/basics/symptoms/CON-20024562.
GAD. Gad is the presence of anxiety that is impairing, problematic, and/or extreme. The anxiety is present most days, throughout the day, and does not have to have a trigger. The anxiety tends to be about anything & everything (hence the generalized part) and out-of-proportion to the reality of one's situation. It's rooted in biological, life story, dimensional, spiritual and/or behavioral perspectives.