Generalized anxiety disorder symptoms can vary. They may include: 
Persistent worrying or anxiety about a number of areas that are out of proportion to the impact of the events
Overthinking plans and solutions to all possible worst-case outcomes
Perceiving situations and events as threatening, even when they aren't
Difficulty handling uncertainty
Indecisiveness and fear of making the wrong decision
Inability to set aside or let go of a worry
Inability to relax, feeling restless, and feeling keyed up or on edge
Difficulty concentrating, or the feeling that your mind "goes blank"
 Physical signs and symptoms may include: 
Fatigue
Trouble sleeping
Muscle tension or muscle aches
Trembling, feeling twitchy
Nervousness or being easily startled
Sweating
Nausea, diarrhea or irritable bowel syndrome
Irritability
 There may be times when your worries don't completely consume you, but you still feel anxious even when there's no apparent reason. For example, you may feel intense worry about your safety or that of your loved ones, or you may have a general sense that something bad is about to happen. Your anxiety, worry or physical symptoms cause you significant distress in social, work or other areas of your life. Worries can shift from one concern to another and may change with time and age. Symptoms in children and teenagers Children and teenagers may have similar worries to adults, but also may have excessive worries about: 
Performance at school or sporting events
Family members' safety
Being on time (punctuality)
Earthquakes, nuclear war or other catastrophic events
 A child or teen with excessive worry may: 
Feel overly anxious to fit in
Be a perfectionist
Redo tasks because they aren't perfect the first time
Spend excessive time doing homework
Lack confidence
Strive for approval
Require a lot of reassurance about performance
Have frequent stomachaches or other physical complaints
Avoid going to school or avoid social situations
 When to see a doctor Some anxiety is normal, but see your doctor if: 
You feel like you're worrying too much, and it's interfering with your work, relationships or other parts of your life
You feel depressed or irritable, have trouble with drinking or drugs, or you have other mental health concerns along with anxiety
You have suicidal thoughts or behaviors — seek emergency treatment immediately
 Your worries are unlikely to simply go away on their own, and they may actually get worse over time. Try to seek professional help before your anxiety becomes severe — it may be easier to treat early on.