How Anxiety Shows Up in Your Body
You've had the same dull headache since Tuesday. Your jaw clicks when you chew. Your stomach has opinions about every meeting on your calendar. You've Googled at least three of these, and not one search result mentioned the thing that might connect them.
We usually talk about anxiety as something that happens in your head: racing thoughts, worst-case scenarios, replaying that text you sent at 11pm. But for a lot of people, the body notices it first. Many people with ongoing anxiety end up at the doctor for a headache or a stomachache long before anyone uses the word "anxiety."
Here's why anxiety shows up physically, the symptoms we hear about most in our Chicago office, what the research says about anxiety, and what can actually help.
Why anxiety is a full-body experience
Anxiety runs on your stress response, the same system that would help you outrun something dangerous. When your brain reads a threat, your sympathetic nervous system and your stress hormones (adrenaline and cortisol) get your body ready to act. Your heart speeds up, your breathing gets faster and shallower, your muscles brace, and digestion gets put on hold.
That system works beautifully for a short emergency. The trouble is that it can't tell the difference between a car swerving toward you and an inbox with 47 unread emails. When worry is constant, the alarm never fully shuts off, and your body keeps paying for an emergency that never quite arrives.
So the physical symptoms aren't imaginary, and they aren't you being dramatic. They're real physiology doing exactly what it was built to do, just too often and for too long.
Common physical symptoms of anxiety
Everyone's body has its own favorite way of sounding the alarm. These are the ones that come up most often.
Tight muscles, clenched jaw, sore shoulders
Muscle tension is so tied to anxiety that it's one of the official diagnostic criteria for generalized anxiety disorder in the DSM-5. Many people carry it in the same few places: the forehead, the jaw, the neck, and the tops of the shoulders. You might notice it as teeth grinding at night, shoulders creeping up toward your ears, or a neck that cracks every time you turn your head.
Racing heart, chest tightness, shortness of breath
A pounding or fluttering heart is one of the most frightening anxiety symptoms because it feels like something is medically wrong. Fast, shallow breathing can follow, sometimes leaving you lightheaded, tingly, or feeling like you can't get a full breath. I've known people who rushed to the emergency room sure they were having a heart attack, only to learn it was a panic attack.
Stomach and gut trouble
Nausea, cramping, "butterflies," and sudden bathroom urgency are all common. Your gut and brain talk to each other constantly, and stress changes how the digestive system moves and how sensitive it feels. In a study of more than 2,000 patients across 15 U.S. primary care clinics, people who were bothered by gastrointestinal symptoms were nearly four times as likely to screen for severe anxiety as people without them (Mussell et al., 2008).
Exhaustion and sleep that doesn't help
Staying on high alert all day is tiring work. Fatigue and trouble falling or staying asleep are also part of the diagnostic picture for generalized anxiety. Many people describe feeling "tired but wired": drained all day, then wide awake the second their head hits the pillow.
Tension headaches
If anxiety had a signature physical symptom, the tension headache would be a strong contender. It's also the most common type of headache: in one large Danish population study, 78% of adults had experienced one at some point in their lives (Jensen, 1999). Most people describe it as a tight band or steady pressure wrapped around the forehead, temples, or back of the head. It usually hits both sides at once and presses rather than throbs. Unlike a migraine, it typically doesn't get worse when you climb the stairs. The muscles in the scalp, jaw, neck, and shoulders are often tender to the touch, which is one more clue that your body has been bracing for longer than you realized.
When to check with a doctor first
Anxiety can explain a lot, but it shouldn't be the first explanation for a new physical symptom. Heart, thyroid, and digestive conditions can look a lot like anxiety, so it's worth getting checked out by a medical provider, especially if a symptom is new or changing.
Call 911 or go to the ER for chest pain or pressure, trouble breathing, fainting, or a sudden, severe headache that feels like the worst of your life. Get prompt medical care for a headache that comes with fever, a stiff neck, confusion, weakness, numbness, vision changes, or one that follows a head injury.
If you've been checked and the answer is "everything looks normal," that doesn't mean your symptoms are fake. It means anxiety may be part of the picture, and that's something therapy can help with.
What actually helps
The good news is that the body-based side of anxiety responds well to body-based tools. Here are a few with real research behind them.
Learn where you hold it. A lot of people don't realize their jaw is clenched until someone points it out. A quick scan a few times a day (forehead, jaw, shoulders, stomach) helps you catch tension before it turns into a headache.
Try progressive muscle relaxation. You tense one muscle group for a few seconds, then let it go, moving slowly through the body. It teaches your nervous system the difference between "braced" and "at rest," which many anxious bodies have forgotten.
Slow your breathing down. Breathing slowly, with an exhale a little longer than the inhale, signals your body that the emergency is over. Even a few minutes can take the edge off a racing heart.
Move your body. Walking, stretching, and other regular movement give all that stress energy somewhere to go. It doesn't need to be intense to count.
How therapy can help
Self-help tools work best when you also get at what's driving the alarm in the first place. In therapy, we look at both: the thoughts and patterns that keep anxiety going, and the way your body has learned to brace against them. Approaches like cognitive behavioral therapy (CBT) and acceptance and commitment therapy (ACT) help you respond to anxious thoughts differently, while body-focused work helps you notice and release tension before it becomes a headache that eats your whole afternoon.
At Snow Lake Counseling, our therapists see clients in person at our Logan Square office in Chicago and virtually across Illinois, Wisconsin, Florida, and Oregon. We accept Aetna, Cigna, BCBS, and United, and we offer sliding scale sessions with our associate clinicians.
Your body has been trying to tell you something. You don't have to figure out what it's saying on your own. Schedule a consultation or call us at 312-509-3113.
References
American Psychiatric Association. (2022). Diagnostic and statistical manual of mental disorders (5th ed., text rev.).
Jensen, R. (1999). Pathophysiological mechanisms of tension-type headache: A review of epidemiological and experimental studies. Cephalalgia, 19(6), 602–621.
Mussell, M., Kroenke, K., Spitzer, R. L., Williams, J. B. W., Herzog, W., & Löwe, B. (2008). Gastrointestinal symptoms in primary care: Prevalence and association with depression and anxiety. Journal of Psychosomatic Research, 64(6), 605–612.