Your child complains of a stomachache every Monday morning. Or maybe it’s headaches that seem to come out of nowhere. You’ve been to the pediatrician. Nothing is physically wrong. But the symptoms keep showing up — and always at the most predictable times.

Here’s what I want every parent to know: anxiety lives in the body. And for children who don’t yet have the words to describe what they’re feeling emotionally, the body often speaks first.

Why Does Anxiety Cause Physical Symptoms?

When the brain perceives a threat — real or imagined — it activates the body’s stress response. Heart rate increases. Muscles tense. The digestive system slows down. This is the fight-or-flight response, and it’s incredibly useful when the threat is real.

But for anxious children, this alarm system gets triggered by things that aren’t actually dangerous — a school presentation, a crowded cafeteria, a birthday party, a substitute teacher. The brain sounds the alarm anyway, and the body responds the same way it would to a real threat.

The result? Very real, very uncomfortable physical symptoms — with no medical explanation.

Physical Symptoms That Are Often Actually Anxiety

🤢 Stomachaches & Nausea

This is the most common one I see. The gut and the brain are deeply connected — so much so that the digestive system is sometimes called the “second brain.” Anxiety can cause stomach cramps, nausea, and even diarrhea. If your child regularly complains of stomachaches before school, social events, or anything new — and the pediatrician has ruled out a physical cause — anxiety is worth exploring.

🤕 Headaches

Tension headaches are extremely common in anxious children. When the body is in a constant low-grade stress response, muscles tighten — especially in the neck, shoulders, and head. These headaches tend to show up on school days, before activities, or during periods of transition.

😴 Fatigue & Low Energy

Anxiety is exhausting. When a child’s nervous system is running on high alert all day — scanning for threats, worrying, holding it together — they come home completely depleted. If your child seems tired despite getting enough sleep, chronic anxiety may be draining their energy reserves.

😵 Dizziness & Shortness of Breath

During moments of acute anxiety, children may feel dizzy, lightheaded, or like they can’t catch their breath. This is the body’s stress response in full swing — breathing becomes shallow, oxygen flow shifts, and the physical sensation can be genuinely frightening, which often makes the anxiety worse.

💓 Racing Heart

Palpitations and a racing or pounding heartbeat are classic anxiety symptoms — but in children, they can feel scary and unfamiliar. A child who says their heart is “beating really fast” or feels “funny in their chest” during stressful moments may be experiencing a physical anxiety response.

😬 Muscle Tension & Physical Restlessness

Tight shoulders, clenched jaw, fidgeting, inability to sit still — these can all be signs of a body carrying anxiety. As an OT, this is where sensory processing comes into play too. Many anxious children are also dealing with sensory sensitivities that keep their nervous system in overdrive.

The Pattern Is the Clue

One stomachache doesn’t mean anxiety. But a pattern — symptoms that show up consistently before certain situations, improve on weekends or holidays, and disappear once the stressful event passes — that pattern is telling you something important.

Ask yourself:

• Do the symptoms appear before school, social events, or transitions?
• Do they go away once the event is over or avoided?
• Has your child’s doctor ruled out a physical cause?

If the answer to all three is yes, anxiety may be at the root.

What To Do When You Suspect Anxiety

First — validate the symptom without reinforcing the avoidance. Your child’s stomachache is real. Their discomfort is real. Saying “you’re fine, nothing is wrong” dismisses what they’re experiencing. Instead try: “I know your tummy feels uncomfortable right now. That’s worry showing up in your body. We’re going to get through this together.”

Second — keep routines intact as much as possible. Allowing a child to stay home or avoid the anxiety-provoking situation provides short-term relief but teaches the brain that the threat was real — and makes the next time harder.

Third — consider getting support. A specialist who understands childhood anxiety can help your child build real, action-based skills to manage what their body is feeling — so they’re not white-knuckling through every hard moment alone.

How I Can Help

As an Occupational Therapist and Child Anxiety Specialist, I look at the whole picture — not just the worry itself, but how sleep, sensory processing, nutrition, and daily habits are fueling your child’s anxiety response. Together, we build a toolkit of skills your child can actually use in real life, long after our sessions end.

If this post resonated with you, I’d love to connect. 💛

👉 Schedule a Free Discovery Call Here or learn more about working together at three23therapy.com

Three23 Therapy provides virtual anxiety support for children and teens across the U.S. and internationally

Peace + Blessings,

Emily Reid, OTR/L

Occupational Therapist, CBIT and Child Anxiety Specialist