The most common type of anxiety disorder is Generalized Anxiety Disorder (GAD). To be diagnosed with GAD, you must experience excessive, uncontrollable anxiety and worry that spans multiple topics and might not match with what's really going on. The worry must occur more often than not for at least six months, and people with GAD might have anxiety that easily transfers from topic to topic. In addition to this, you must also display at least three of the following symptoms: Feeling edgy or restless Getting tired or fatigued easily Feeling irritable Muscle aches or soreness – anxiety can cause tension in the neck, jaw, chest, stomach, and other areas of the body Having trouble falling asleep, staying asleep, feeling restless at night, or not feeling well-rested