What causes generalized anxiety?

Generalized anxiety has no single cause. The National Institute of Mental Health describes it as a mix of genetics, brain chemistry, biology and environment, and in everyday terms that means inherited risk, temperament and life stress working together. It is not a character flaw, and only a licensed clinician can diagnose generalized anxiety disorder.

If you are asking what causes generalized anxiety, you may also be asking a quieter question: did I do this to myself? Maybe someone has told you to stop overthinking. Maybe you have wondered why other people seem to let things go when you can't.

Wanting an explanation makes sense. This article walks through three layers that research points to, the difference between what starts anxiety and what keeps it going, and what you can do about the parts that can change.

What generalized anxiety is and who it affects#

Generalized anxiety disorder (GAD) is a condition in which worry about everyday things is frequent, intense and hard to control, and it can last for months or even years (NIMH, 2025).

Everyone worries about health, money, work or family sometimes. With GAD, the worry is out of proportion to the situation and gets in the way of daily life. Our article on when worry becomes a disorder looks at where that line sits.

NIMH notes that GAD develops gradually and usually starts in early adulthood, although it can begin at any age. Symptoms commonly associated with it include:

• Worry that is hard to control on most days
• Feeling restless, irritable or on edge
• Trouble concentrating
• Trouble falling or staying asleep, or feeling fatigued
• Muscle tension, headaches or stomachaches

GAD is more common than many people assume. Drawing on the National Comorbidity Survey Replication, NIMH estimates that 2.7% of U.S. adults had generalized anxiety disorder in the past year and that 5.7% experience it at some point in their lives (NIMH statistics). Past-year rates were higher for women (3.4%) than for men (1.9%).

A list like this cannot tell you whether you have GAD. For a diagnosis, NIMH says worry must be hard to control on most days for at least six months, along with at least three related symptoms. Only a licensed clinician can make that call.

For a fuller picture, see our guide to the symptoms, causes and treatment of generalized anxiety disorder.

Prefer to listen? This article is also a podcast episode on the MentalSpace Therapy podcast. Subscribe on Apple Podcasts / Spotify / your favorite platform.

What causes generalized anxiety, layer by layer#

Generalized anxiety usually comes from several causes acting together, and no single gene, event or habit explains it by itself.

Quick answer: Picture three layers that stack: what you inherited, how you are wired, and what has happened to you.

A home security system is a handy way to picture it. Your genes are the system that came with the house, and your temperament is how sensitive the motion sensor is set. Life stress is the run of real break-ins that keeps setting it off.

| Layer | What it means | What the research says | |---|---|---| | What you inherited | Family history and genes | Twin studies put heritability at about 32% | | How you are wired | Temperament, including how you handle uncertainty | Shy or withdrawn traits are a listed risk factor for anxiety disorders | | What has happened to you | Trauma and long-running stress | Traumatic events and stressful environments may raise risk |

The source for each row is linked in the sections below.

Layer one: what you inherited

Anxiety tends to run in families. If your mom or your granddad was known as "a worrier," that is a clue about your own risk. It is not a sentence.

One often-cited estimate comes from a meta-analysis of twin studies in the American Journal of Psychiatry. It put the heritability of generalized anxiety disorder at 0.32, or roughly a third (American Journal of Psychiatry, 2001).

Heritability: the share of the differences in risk across a large group of people that traces back to genetic differences. It does not mean a third of any one person's anxiety is genetic.

The same analysis found that experiences unique to each person play a significant role too. Genes load the dice. They do not decide the outcome.

NIMH also names brain chemistry and biology as part of the mix, and it says the exact cause is still unknown (NIMH, 2025).

Layer two: how you are wired

Temperament is the second layer. Some people have always had a sensitive alarm system. They scan for what could go wrong and have a hard time with not knowing.

MedlinePlus, a service of the National Library of Medicine, lists certain personality traits, such as being shy or withdrawn in new situations or around new people, among the general risk factors for anxiety disorders (MedlinePlus, 2023).

Researchers have also studied a trait called intolerance of uncertainty.

Intolerance of uncertainty: a tendency to find not knowing very hard to bear and to react strongly to uncertain situations.

A 2023 systematic review and meta-analysis in the Journal of Anxiety Disorders describes a strong link between intolerance of uncertainty and GAD (Journal of Anxiety Disorders, 2023). A link is not proof that one causes the other. It may help explain why "what if" questions can feel so urgent.

Layer three: what has happened to you

Life experience is the third layer. NIMH reports that experiencing a traumatic event or being in a stressful environment may put a person at higher risk of developing GAD (NIMH, 2025). MedlinePlus also lists traumatic events in early childhood or adulthood as a risk factor.

A stressful environment can take many forms: a rough childhood, a long season of caregiving, a job loss, grief, or years of money pressure. Stress like that does not lead to GAD in everyone. For some people, it is part of how everyday worry turns into worry that rarely switches off.

Stress also matters once anxiety is present. NIMH notes that GAD symptoms may rise and fall over time and are often worse during stressful periods, such as a physical illness or a family conflict.

NIMH adds that some people with GAD also have depression. If low mood is part of your picture, our article on when anxiety and depression show up together may help.

What starts anxiety versus what keeps it going#

Cognitive behavioral therapy, a well-studied talk therapy for generalized anxiety, works on the present-day thinking and behavior patterns that keep worry going. It does not try to change where the worry came from.

Quick answer: You cannot change your genes or your past. You can work on the patterns that feed worry now, and that is where therapy puts its effort.

Cognitive behavioral therapy (CBT): a structured talk therapy that helps you notice automatic thoughts that are inaccurate or harmful, question them, and change behavior patterns that keep you anxious. NIMH describes it as well studied and the "gold standard" choice of psychotherapy for GAD (NIMH, 2025).

Patterns a therapist may look at with you include:

1. Avoidance. Putting off calls, decisions or plans because the outcome feels uncertain.
2. Reassurance-seeking. Asking the same question again and again, or checking repeatedly, to feel sure.
3. Worry as problem-solving. Lying awake working through tomorrow's problems because it feels productive.
4. Running short on sleep. NIMH notes that getting enough sleep is one of the healthy choices that can reduce anxiety symptoms when paired with standard care.

In the security-system picture, these habits are what keep the alarm ringing after the street is quiet again.

Here is a made-up example of how therapy can work on avoidance. Imagine someone who has stopped opening their email because every unread message feels like bad news. Working with a therapist, they would likely not start with the whole inbox.

They might first name the thought behind the dread, then take small steps: open the laptop, read one email, then two. MedlinePlus notes that CBT may include exposure therapy, which focuses on confronting fears so you can do the things you have been avoiding (MedlinePlus, 2023).

There is evidence that the uncertainty piece can shift. The 2023 review mentioned above pooled 26 studies with 1,199 adults with GAD. On average, both intolerance of uncertainty and worry were lower after psychological treatment (Journal of Anxiety Disorders, 2023).

Averages do not predict any one person's result, and progress looks different for everyone. CBT is also not the only option. NIMH describes acceptance and commitment therapy (ACT) as another approach, one that encourages nonjudgmental acceptance of thoughts.

Whether medication has a place in your care is a decision for a licensed prescriber. For more on what care can involve, read our overview of GAD symptoms and treatment in Georgia.

We dove deeper into this on our YouTube channel. Watch the full episode for the three layers explained as a home security system, the habits that keep the alarm ringing, and a step-by-step example of how CBT works on avoidance.

Medical conditions that can look like anxiety#

A physical health problem can sometimes be behind symptoms that look like anxiety, which is why a medical checkup is a sensible early step.

MedlinePlus lists some physical health conditions, such as thyroid problems or arrhythmia (an irregular heartbeat), among the risk factors for anxiety disorders (MedlinePlus, 2023).

Checking for them is part of a standard evaluation. NIMH explains that a provider may do a physical exam to make sure an unrelated physical problem is not causing your symptoms (NIMH, 2025). MedlinePlus adds that lab tests may be used for the same reason.

If you have not had a checkup lately, tell your doctor what you have been feeling and when it started. That information is useful whether or not anything physical turns up.

What generalized anxiety is not#

Generalized anxiety is not a weakness, a lack of willpower, a lack of faith or a poor work ethic. The research summarized above points to genes, temperament and life stress, not character.

You also did not cause it by "overthinking." Worry that is hard to control is a symptom of the condition. It is not the reason for it.

Here is a made-up example, not a real person. Imagine someone who has always been the planner in the family and whose mother was a lifelong worrier. After two years of caring for a sick relative while money was tight, the planning turns into lying awake most nights.

No single piece of that story is "the cause." All three layers are in it.

The cause you assume shapes what you do next. If you believe worry is a personal failing, hiding it can seem like the only choice. If you see it as a health condition with known risk factors, asking for help makes more sense.

What therapy for generalized anxiety looks like at CHC#

At Coping & Healing Counseling, therapy for generalized anxiety happens by HIPAA-compliant video with a licensed Georgia therapist.

We are a 100% telehealth practice with 15+ licensed therapists (LCSWs, LPCs and LMFTs), and anxiety is one of our specialties. We see adults and teens ages 13 and up in all 159 Georgia counties.

Meeting by video is a recognized way to do this work. NIMH notes that psychotherapy can be effective when delivered in person or virtually through telehealth (NIMH, 2025).

Every therapist works a little differently, but therapy for constant worry often includes these steps:

1. Understand your layers. Talk through family history, temperament and the stress you have been under.
2. Map what keeps worry going. Identify the thoughts and habits described above.
3. Practice new responses. Try different ways of thinking and reacting, in sessions and between them.
4. Review and adjust. Check what is helping and change the plan when needed.

NIMH is candid that finding the best treatment may take some trial and error and that psychotherapy can take time to work. No therapist can promise a specific result.

Practical takeaways for this week#

These are small steps you can take this week while you decide about getting help. Healthy habits can support treatment, but NIMH is clear that they cannot replace it.

• Ask about family history. Find out whether relatives dealt with constant worry or "nerves." It is useful context to share with a clinician.
• Book a checkup. Tell your doctor about your symptoms so physical causes can be checked.
• Track the pattern for a week. Note when worry spikes, what you put off, and how you slept.
• Protect your sleep and watch your caffeine. NIMH lists getting enough sleep and reducing caffeine among the healthy choices that can reduce anxiety symptoms alongside standard care (NIMH, 2025).
• Try one calming skill. NIMH also names exercise, mindfulness and meditation as stress management techniques that can reduce symptoms. Our guide to evidence-based ways to calm anxiety quickly has options.

Frequently Asked Questions#

Is generalized anxiety genetic?

Partly. A 2001 meta-analysis of twin studies estimated the heritability of generalized anxiety disorder at about 32 percent, and the condition tends to run in families. Genes raise risk without deciding the outcome, and life experience and other non-genetic factors account for the rest.

Can stress cause generalized anxiety disorder?

Stress alone is not considered the single cause. NIMH reports that experiencing a traumatic event or living in a stressful environment may put a person at higher risk of developing GAD. Symptoms also tend to get worse during stressful periods, such as an illness or a family conflict.

At what age does generalized anxiety usually start?

According to NIMH, generalized anxiety disorder develops gradually and usually starts in early adulthood, although it can begin at any age. Children and teens can have it too, and their worries often center on school, friendships and the future. A licensed clinician can assess symptoms at any age.

Can a medical condition cause anxiety symptoms?

Yes, a physical health problem can be behind symptoms that look like anxiety. MedlinePlus lists conditions such as thyroid problems and arrhythmia among the risk factors for anxiety disorders. That is why a provider may do a physical exam and lab tests before settling on a diagnosis.

Is generalized anxiety caused by overthinking?

No, worry that is hard to control is a symptom of generalized anxiety disorder, not its cause. Research describes the cause as a mix of genetics, brain chemistry, biology and environment. Therapy can help with the thinking habits that keep worry going, but having them is not a personal failing.

How is generalized anxiety disorder diagnosed?

Only a licensed clinician can diagnose it. According to NIMH, a diagnosis requires worry that is hard to control on most days for at least six months, plus at least three symptoms such as restlessness, fatigue, trouble concentrating, irritability, muscle tension or sleep problems. Online screenings can point you toward help but cannot diagnose.

When to seek professional help#

It is time to talk with a professional when worry has been hard to control for months and is getting in the way of sleep, work, school or relationships.

You do not have to be sure it is GAD first. A good starting point is our Free anxiety test, which is a screening, not a diagnosis.

From there, learn more about anxiety therapy at CHC or how online therapy in Georgia works. Our 15+ licensed therapists see clients by HIPAA-compliant video in all 159 Georgia counties.

Medicaid is a $0 copay. We also accept Aetna, Cigna, BCBS, UHC and Humana, with sessions typically $10 to $40 depending on your plan. Call (404) 832-0102, email support@chctherapy.com, or get started online.

If you are in crisis: call or text 988 (Suicide & Crisis Lifeline) or call the Georgia Crisis & Access Line at 1-800-715-4225. If you or someone you know is in immediate danger, call 911 or go to your nearest emergency room.

Knowing what causes generalized anxiety will not make it disappear, but it can take blame out of the picture. Genes, temperament and stress set the stage, and the patterns that keep worry going are something you can work on with support.

References#

• National Institute of Mental Health. (2025). Generalized Anxiety Disorder: What You Need to Know. nimh.nih.gov
• National Institute of Mental Health. Generalized Anxiety Disorder (statistics). nimh.nih.gov
• A review and meta-analysis of the genetic epidemiology of anxiety disorders. American Journal of Psychiatry, 158(10), 1568-1578 (2001). PubMed 11578982
• MedlinePlus, National Library of Medicine. (2023). Anxiety. medlineplus.gov
• The impact of psychological treatment on intolerance of uncertainty in generalized anxiety disorder: A systematic review and meta-analysis. Journal of Anxiety Disorders, 97, 102729 (2023). PubMed 37271039

Last updated: October 10, 2026.