Why Does POTS Cause Chest Pain (And Why It’s Usually Not Your Heart)?

Why Does POTS Cause Chest Pain (And Why It’s Usually Not Your Heart)?
The first time I had chest pain with POTS I was convinced something was seriously wrong. Not POTS wrong. Heart attack wrong. It was that kind of tight, pressured, alarming sensation that makes you go completely still and try to figure out if you need to call someone. I ended up in urgent care more than once before I understood what was actually causing it.
If you have POTS and you experience chest pain, you already know how destabilizing it is. And if nobody has ever explained to you why it happens, it stays terrifying every single time. So here is what is actually going on.
Your heart is working harder than it should have to
The core of POTS is an abnormal heart rate increase when you move to an upright position. When you stand up, blood pools in your lower body and your heart rate spikes compensating for the reduced blood return. In a healthy system that spike is modest and brief. In POTS it can be dramatic and sustained.
When your heart is beating significantly faster than normal for extended periods, the heart muscle itself is under more strain. It is doing more work per minute than it is designed to sustain comfortably. That increased workload can produce a sensation of pressure, tightness, or aching in the chest. It is not damage. It is effort. The same way your legs ache after a long run, your heart muscle can ache when it has been working overtime.
The role of the sympathetic nervous system
In POTS, the sympathetic nervous system, the branch responsible for fight or flight responses, is often in a state of chronic overdrive. It is constantly sending signals to your heart to speed up, to your blood vessels to constrict, and to your whole system to stay alert and compensate for the circulation problem.
That sustained sympathetic activation does several things that contribute to chest pain. It keeps the muscles around your chest and ribcage in a state of tension. It affects the coronary arteries, the vessels that supply blood to the heart muscle itself, causing them to constrict slightly. And it can create a kind of referred discomfort that radiates through the chest wall and sometimes into the shoulders or throat.
This is also why chest pain in POTS often comes with the same package of symptoms as an anxiety attack, racing heart, shortness of breath, shakiness, dread. The sympathetic nervous system is driving all of it from the same source.
Why the chest wall itself is often the culprit
Something that does not get talked about enough is how much of POTS chest pain is actually coming from the muscles and cartilage of the chest wall rather than the heart at all.
When your body is in a state of chronic sympathetic overdrive, the muscles between and around your ribs stay partially contracted. They do not fully relax the way they should. Over time that sustained tension produces a real, physical ache that sits right where you would expect heart pain to be. It can be sharp when you breathe deeply. It can be tender to touch. It can feel worse when you are upright and better when you are lying down.
This is called musculoskeletal chest pain and it is extremely common in people with dysautonomia. It is also completely benign, which does not make it less uncomfortable, but does make it significantly less dangerous than it feels.
Why it often feels worse when you are upright and better lying down
This is one of the clearest signs that POTS is driving the chest pain rather than a structural cardiac problem. Cardiac chest pain from conditions like blocked arteries typically does not change dramatically based on whether you are standing or lying down. POTS chest pain almost always does.
When you lie down, blood returns more easily to your heart, your heart rate comes down, the orthostatic challenge disappears, and the sympathetic overdrive eases. The chest pain often settles within minutes. That positional pattern is a significant indicator that what you are experiencing is autonomic in origin.
When to take chest pain seriously
None of this means you should ignore chest pain completely. If you are experiencing chest pain that is severe, radiating down your left arm, accompanied by sweating and nausea in a way that feels different from your usual POTS symptoms, or if it does not ease when you lie down, those are reasons to seek evaluation. Getting your heart properly assessed when you are first diagnosed with POTS is important so that you have a baseline and can recognise what is typical for you versus what is not.
But once you have had a proper workup and your heart has been cleared, understanding that the chest pain is coming from effort, tension, and autonomic misfiring rather than cardiac damage can genuinely change how you experience it. Fear amplifies pain. Understanding reduces it.
As your reconditioning progresses and your heart rate becomes more regulated, and as your sympathetic nervous system stops firing at maximum intensity all the time, the chest pain tends to decrease along with everything else. Your heart gets more efficient. Your nervous system calms down. The whole system stops working so hard just to keep you upright.
You are not dying. Your body is just trying extremely hard, in a very inefficient way, to keep you going. And that effort has a sensation. Now you know what it is.
If you want to learn more about how to support your system and start rebuilding your capacity from where you are right now, join the POTS Recovery Club community at potsrecoveryclub.com/club