Anxiety

Everyone feels anxious from time to time, like when you're running late or interviewing for a job. People with generalized anxiety disorder (GAD), feel some anxiety or worry almost all the time. This is not healthy. People should have someworries in there life but should not always worry about one thing or another. GAD affects their body, too. In fact, many people with generalized anxiety disorder visit their doctor with problems — like sleep troubles or muscle aches, without understanding these are common symptoms of generalized anxiety disorder. About 5% of U.S. adults experience generalized anxiety disorder at some point during their lifetime, and about 3% have it in any given year.Restlessness or a feeling of being "keyed up" or "on edge"
Being easily fatigued, Difficulty concentrating or a sense of your mind going blank ,Irritability, Muscle tension, and Difficulty sleeping are syptoms.
Other physical symptoms associated with generalized anxiety disorder include,
Trembling, twitching, muscle soreness, Headaches, sweating or chills, nausea,dizziness, Shortness of breath, Diarrhea, Irritable bowel syndrome,and Being easily startled. So keep this in mind just incase you or someclose is being tormented by this disease.