Standing up should be simple.
You get out of bed. You walk into the kitchen. You take a shower. You stand in line at the store. Your body is supposed to adjust without you thinking about it.
But for people with POTS, standing can feel like a full body event.
Your heart may start racing. You may feel dizzy, shaky, weak, nauseated, sweaty, short of breath, or close to fainting. Your brain may feel foggy. Your legs may feel heavy. A hot shower may wipe you out. A trip to the grocery store may feel like much more than it should.
If this sounds familiar, you are not imagining it. One possible explanation is POTS, which stands for postural orthostatic tachycardia syndrome.
POTS is a condition that affects how your body responds when you move into an upright position. It is often frustrating, often misunderstood, and often missed for too long. The good news is that once POTS is recognized, many patients can begin taking practical steps to better manage their symptoms.
At Prime Heart & Vascular, our cardiology team helps patients in Plano, Frisco, Allen, and the greater Dallas area evaluate symptoms such as a racing heart, dizziness, fainting, fatigue, shortness of breath, and exercise intolerance.
What Is POTS?
POTS is a type of dysautonomia. That means it involves the autonomic nervous system, the part of your body that helps control automatic functions like heart rate, blood pressure, blood vessel tightening, digestion, sweating, and temperature regulation.
The word “postural” means related to body position. “Orthostatic” means upright posture. “Tachycardia” means a fast heart rate. So, in plain English, POTS describes a condition where the heart rate rises too much when a person moves from lying down or sitting to standing.
A common diagnostic pattern in adults is a heart rate increase of at least 30 beats per minute within 10 minutes of standing or tilt table testing, without a major drop in blood pressure. In teens, the heart rate threshold is often higher. Symptoms also need to fit the picture, because POTS is not diagnosed by heart rate alone.
That last part matters.
Plenty of things can make the heart beat faster. Dehydration, anemia, thyroid problems, infection, medication side effects, anxiety, heart rhythm disorders, and other medical problems can all cause a racing heart. A careful evaluation helps sort out whether symptoms are truly due to POTS or something else that needs a different treatment plan.
Why Does POTS Make Your Heart Race When You Stand?
When you stand up, gravity pulls blood downward into your legs and lower body. Your body normally responds right away. Blood vessels tighten. Heart rate changes slightly. Blood keeps moving back toward the heart and brain.
Most people never notice this happening.
With POTS, that adjustment does not work smoothly. Blood may pool in the lower body. Less blood may return to the heart. The brain may receive less steady blood flow for a moment. Your body may respond by pushing the heart to beat faster in an effort to keep blood moving.
That racing heart can feel scary, but in many POTS patients, it is not because the heart itself is damaged. It is often the body trying to compensate for a circulation and nervous system problem.
This is one reason POTS can be so confusing. A patient may feel intense symptoms, but standard heart tests may not always show a dangerous heart condition. That does not mean the symptoms are fake. It means the problem may be in the way the nervous system, blood vessels, blood volume, and heart rate response are working together.
Common Symptoms of POTS
POTS does not look exactly the same in every patient. Some people mainly notice dizziness and palpitations. Others struggle with fatigue, brain fog, headaches, stomach symptoms, heat intolerance, or feeling wiped out after normal activity.
Common POTS symptoms may include:
- A fast heartbeat after standing
- Heart palpitations
- Dizziness or lightheadedness
- Feeling faint or actually fainting
- Shakiness or trembling
- Weakness
- Fatigue
- Brain fog or trouble concentrating
- Shortness of breath
- Chest discomfort
- Nausea
- Bloating or stomach discomfort
- Headaches
- Sweating changes
- Exercise intolerance
- Poor sleep
- Feeling worse in heat
- Feeling worse after illness, dehydration, standing too long, or a large meal
Some patients also notice symptoms after a viral illness, surgery, pregnancy, a period of bed rest, or a major physical stressor. Others can trace milder symptoms back for years before they became more disruptive.
The key pattern is that symptoms often worsen when upright and improve when lying down. That positional clue can be important.
Is POTS Just Anxiety?
No. POTS is not “just anxiety.”
This is one of the most important things patients need to hear.
Can anxiety and POTS overlap? Yes. Feeling your heart race, getting dizzy in public, or worrying that you may faint can understandably make a person anxious. Some patients also develop anxiety after months or years of not knowing what is wrong.
But anxiety does not explain everything about POTS. POTS has measurable physical features, especially the abnormal heart rate response to standing. Many patients are told they are anxious before anyone checks orthostatic vital signs, reviews their full symptom pattern, or considers autonomic dysfunction.
A better way to think about it is this: the body and the brain are connected. POTS can create real physical symptoms, and those symptoms can be stressful. Good care should take the symptoms seriously, not dismiss them.
Why POTS Is Often Missed
POTS can be hard to recognize because the symptoms overlap with many other conditions.
A patient may go to the doctor because of dizziness. Another may mention fatigue. Another may complain of chest discomfort, stomach problems, shortness of breath, fainting, or brain fog. If no one connects those symptoms to standing, the bigger pattern may be missed.
POTS can also affect people who look healthy on the outside. That can make the experience even more frustrating. A patient may be told, “Your tests look normal,” even though daily life feels anything but normal.
Many patients with POTS report long delays before diagnosis. Some see multiple clinicians. Some are told to drink more water, reduce stress, exercise more, or “push through it,” without a full evaluation. While hydration, activity, and conditioning can be part of treatment, patients deserve to know what is actually happening first.
That is why a thoughtful history matters so much. The details are often where the answer begins.
How POTS Is Evaluated
A POTS evaluation usually starts with listening.
When did the symptoms begin? Do they happen mostly when standing? Do they improve when lying down? Have you fainted? Do symptoms get worse in heat, after meals, during your menstrual cycle, after illness, or with dehydration? Are there palpitations, chest discomfort, shortness of breath, fatigue, headaches, stomach issues, or brain fog? What medications or supplements are you taking? Have you had anemia, thyroid disease, autoimmune issues, joint hypermobility, or other conditions?
From there, testing may be used to look at heart rate, blood pressure, rhythm, and other possible causes.
At Prime Heart & Vascular, evaluation may include a conversation about symptoms, medical history, medications, hydration habits, exercise tolerance, recent illness, and fainting episodes. Depending on the situation, testing may include heart rhythm monitoring, an electrocardiogram, echocardiogram, blood pressure and heart rate checks, or other cardiac testing.
The goal is not simply to put a label on symptoms. The goal is to understand the full picture, rule out more serious heart concerns, and help the patient take the right next step.
What Can Mimic POTS?
POTS symptoms can be real even when POTS is not the final diagnosis. That is why medical evaluation matters.
Conditions or factors that may cause similar symptoms include:
- Dehydration
- Blood loss
- Anemia
- Thyroid problems
- Heart rhythm disorders
- Medication side effects
- Prolonged bed rest or deconditioning
- Low blood pressure conditions
- Infection or recent illness
- Pregnancy related changes
- Anxiety or panic symptoms
- Other autonomic disorders
A cardiology evaluation can help separate POTS from other causes of a racing heart, dizziness, fainting, or shortness of breath. This is especially important when symptoms are new, worsening, or interfering with normal activities.
Who Gets POTS?
POTS can affect different types of patients, but it is often seen in teens and young to middle aged adults. It is more commonly reported in females, though males can have it too.
Some patients develop symptoms after a clear trigger, such as a viral illness or a period of reduced activity. Others have associated conditions that may complicate the picture, such as migraine, chronic fatigue, joint hypermobility, Ehlers Danlos syndrome, gastrointestinal symptoms, sleep problems, or mast cell related symptoms.
Not every patient has all of these issues. POTS is not one single experience. It is more like a pattern of abnormal upright intolerance that can have different drivers in different people.
That is why treatment should not be copied from someone else’s story online. What helps one patient may not be right for another.
Is POTS Dangerous?
POTS is usually not considered life threatening, but it can be life changing.
That distinction is important.
Many patients with POTS are told, “It is not dangerous,” and they hear, “It does not matter.” But those are not the same thing. POTS can interfere with work, school, exercise, driving, parenting, social life, and simple daily routines. Fainting can also increase the risk of injury from falls.
So while POTS may not usually be dangerous in the same way as a heart attack or a life threatening rhythm problem, it still deserves careful attention. A condition does not have to be life threatening to deserve treatment.
Can POTS Get Better?
Many people with POTS improve, especially with the right diagnosis, education, trigger management, and a treatment plan that fits the patient.
Treatment often begins with non medication strategies. These may include improving hydration, adjusting salt intake when appropriate, using compression garments, avoiding known triggers, and gradually building physical conditioning.
Exercise is often part of POTS care, but it needs to be approached carefully. For many patients, starting with upright exercise is too much. Recumbent or horizontal activities, such as a recumbent bike, rowing, or swimming, may be better tolerated early on. Over time, activity can often be advanced gradually.
This does not mean POTS is caused by laziness or being out of shape. That idea is both unhelpful and unfair. Rather, POTS can make activity difficult, and reduced activity can then make symptoms worse. A structured plan can help break that cycle.
Some patients may also need medications, especially when lifestyle strategies are not enough. Medication choices depend on the patient’s symptoms, blood pressure, heart rate pattern, other medical conditions, and test results.
What Makes POTS Symptoms Worse?
Triggers vary from person to person, but many patients report that symptoms flare with:
- Heat
- Hot showers
- Dehydration
- Standing still for long periods
- Alcohol
- Large meals
- Illness
- Poor sleep
- Overexertion
- Menstrual cycle changes
- Stress on the body
- Skipping meals
- Prolonged bed rest
Learning your triggers does not cure POTS, but it can help you plan better. For example, a patient who knows heat is a major trigger may need to be careful with hot showers, outdoor summer activities, saunas, or standing in warm rooms. A patient who gets worse after large meals may do better with smaller meals spaced through the day.
Small changes can add up.
When Should You See a Cardiologist?
You should consider seeing a cardiologist if you regularly experience a racing heart, dizziness, fainting, near fainting, chest discomfort, shortness of breath, or unusual fatigue when standing or walking.
It is especially important to get evaluated if symptoms are new, worsening, or affecting your ability to work, go to school, exercise, drive, shop, shower, or care for your family.
You should seek urgent medical attention if you have severe chest pain, severe shortness of breath, fainting with injury, fainting during exercise, signs of stroke, or symptoms that feel sudden and dangerous.
For ongoing symptoms that sound like POTS, a cardiology visit can help answer an important question: is this POTS, another heart related issue, or something else entirely?
How Prime Heart & Vascular Helps Patients With POTS Symptoms
At Prime Heart & Vascular, we understand how discouraging these symptoms can be. Many patients with POTS have spent a long time trying to explain what is happening in their body. They may have been told their symptoms are stress, anxiety, dehydration, or nothing serious.
Our team takes these symptoms seriously.
We help patients in Plano, Frisco, Allen, and the greater Dallas area evaluate symptoms such as rapid heartbeat, dizziness, lightheadedness, fainting, palpitations, fatigue, shortness of breath, and exercise intolerance. The purpose is to look at the full picture, rule out concerning heart problems, and build a plan that makes sense for your body.
You can learn more about our approach to POTS treatment at Prime Heart & Vascular.
The Bottom Line
POTS can make standing feel harder than it should. It can cause a racing heart, dizziness, fatigue, brain fog, shortness of breath, headaches, nausea, and sometimes fainting. It is often misunderstood, but it is real.
The heart racing in POTS is often the body’s attempt to compensate for trouble adjusting to upright posture. That does not mean the symptoms are harmless, and it does not mean they should be ignored.
If your heart races when you stand, or if dizziness, fainting, fatigue, or shortness of breath are interfering with your life, it is worth getting checked. You deserve answers, and you deserve a plan that helps you move forward with more confidence.
Get Help with Your POTS
POTS stands for postural orthostatic tachycardia syndrome. It describes a condition where the heart rate rises too much after standing, along with symptoms such as dizziness, palpitations, fatigue, brain fog, nausea, or feeling faint.
Your heart may race when you stand because gravity pulls blood into the lower body, and your body has to work harder to move blood back toward the heart and brain. In POTS, that adjustment does not work smoothly, so the heart rate may rise too much in an effort to compensate.
POTS affects heart rate, but it is often related to the autonomic nervous system and circulation rather than a structural heart problem. A cardiology evaluation is still important because other heart rhythm or cardiovascular issues can cause similar symptoms.
Yes, some people with POTS faint or nearly faint. Others feel lightheaded, weak, shaky, or unsteady without fully passing out. Fainting should be evaluated because it can lead to injury and may have several possible causes.
No. POTS is not the same as anxiety. Anxiety can sometimes happen alongside POTS, and POTS symptoms can feel frightening, but POTS involves a physical change in heart rate and upright tolerance. Patients should not be dismissed without a proper evaluation.
POTS treatment depends on the patient. It may include hydration, salt adjustment when appropriate, compression garments, trigger management, gradual exercise, and sometimes medication. Patients should not dramatically increase salt, fluids, or start medications without medical guidance, especially if they have high blood pressure, kidney disease, heart disease, or other medical conditions.