Why Do POTS Symptoms Flare? Understanding Common and Overlooked Triggers
One of the most frustrating things about living with Postural Orthostatic Tachycardia Syndrome (POTS) is that sometimes symptoms can flare even when it feels like nothing has changed.
You might be doing all the things that usually help manage your symptoms, but suddenly you're experiencing more dizziness, fatigue and heart palpitations.
This is because POTS is influenced by several different physiological processes, including blood volume, circulation, autonomic nervous system activity, hormones, digestion, temperature and the overall demands being placed on your body.
Some triggers are obvious, like heat or dehydration, but others can be easy to miss.
And sometimes, it's not just one trigger, it's the accumulation of several smaller stressors that can make symptoms more difficult to manage.
Understanding these triggers can be an important part of recognising patterns and finding ways to better support your body.
What Actually Happens During a POTS Flare?
Something I think is really important to understand about POTS is that experiencing a flare doesn't mean your condition is getting permanently worse.
A POTS flare generally refers to a temporary increase in symptoms, which might include dizziness, tachycardia, fatigue, brain fog, nausea or exercise intolerance.
Sometimes, a trigger is simply placing additional demands on an autonomic nervous system that is already struggling to regulate.
This is something I really want people to understand: your body isn't the enemy.
Your body is constantly trying to adapt and maintain balance, but sometimes the demands being placed on it exceed what it can currently manage.
A flare can be a sign that your body is having difficulty compensating, rather than a sign that you're losing all the progress you've made.
Of course, new, severe or persistently worsening symptoms shouldn't automatically be attributed to POTS and may need further medical assessment.
1. Temperature, Humidity and Weather Changes
One of the more common and well-recognised triggers for POTS symptoms is heat.
When we're exposed to higher temperatures, our blood vessels dilate to help regulate body temperature. For someone with POTS, this can make it harder to maintain adequate blood return to the heart, potentially increasing symptoms such as dizziness, fatigue and heart palpitations.
Humidity can make this even more challenging because it reduces how effectively sweat evaporates, making it harder for the body to cool itself down.
This is why activities like hot showers, spending time outdoors during summer or being in poorly ventilated environments can be challenging.
What about barometric pressure?
Another environmental factor that some people with POTS report being sensitive to is changes in barometric pressure, particularly the drop in atmospheric pressure that often occurs before storms.
Barometric pressure refers to the pressure exerted by the atmosphere around us. As this pressure changes, it's possible that it may influence vascular function and the way our bodies regulate circulation.
One proposed explanation is that a reduction in atmospheric pressure may influence blood vessel behaviour, potentially contributing to vasodilation and increased blood pooling in the lower extremities.
2. Eating and Digestion
Another trigger that people don't always associate with POTS is eating.
After we eat, blood flow increases to the digestive system to support digestion. This is a normal physiological response, but for someone with POTS, it can make maintaining adequate circulation more challenging.
As a result, some people experience increased dizziness, fatigue, heart palpitations or brain fog after meals.
Larger meals and meals that are particularly high in carbohydrates may make these symptoms more noticeable for some people.
However, individual responses vary. Some people experience significant symptoms after eating, while others may not notice much of a change.
For those who struggle with post-meal symptoms, smaller, more frequent meals may be one strategy worth exploring, while ensuring adequate nutrition and energy intake throughout the day.
The goal isn't to unnecessarily restrict food, but to understand how digestion influences your symptoms and find an approach that works for your body.
3. Hormonal Changes
Hormonal fluctuations are another factor that can influence POTS symptoms, particularly for people who menstruate.
Changes in oestrogen and progesterone throughout the menstrual cycle can influence vascular function, fluid regulation and autonomic activity.
Some people notice their symptoms become more difficult to manage around menstruation, while others experience changes around ovulation or during the premenstrual phase.
These patterns are highly individual.
Tracking symptoms alongside your menstrual cycle may help identify whether hormonal changes are contributing to recurring flares.
4. Stress, Poor Sleep and Overall Physiological Load
When we talk about stress and POTS, it's important to understand that stress doesn't just mean emotional stress.
Physical illness, poor sleep, sensory overload, prolonged activity and even excitement can increase the demands placed on the autonomic nervous system.
Because POTS already involves difficulties with autonomic regulation, these additional demands may make symptoms harder to manage.
This doesn't mean POTS is psychological or that symptoms are caused by anxiety.
POTS is a physiological condition, and stress is one of many factors that can influence how the body functions.
Poor sleep may also affect autonomic regulation, fatigue and the body's ability to tolerate everyday activities.
Sometimes, what appears to be a flare without an obvious trigger is actually the result of several smaller demands accumulating over time.
5. Dehydration and Changes in Blood Volume
Blood volume and hydration can play an important role in POTS symptom management.
Many people with POTS experience reduced blood volume or difficulties maintaining effective circulation when upright.
When fluid intake is inadequate, or when additional fluids are lost through sweating, illness or other factors, symptoms can become more pronounced.
This is one reason hydration and, when medically appropriate, increased sodium intake are commonly included in POTS management strategies.
However, fluid and sodium requirements should be individualised, particularly for people with other medical conditions that may affect fluid balance.
Why Identifying Your POTS Triggers Matters
One of the most valuable things you can do when managing POTS is begin to understand your individual symptom patterns.
Not every flare will have one clear explanation, and not every trigger will affect everyone in the same way.
You might find that heat is manageable on a well-rested day but becomes much harder to tolerate after poor sleep, a large meal or several days of increased activity.
This is where understanding your overall physiological load becomes important.
Rather than looking at each trigger in isolation, it can be helpful to consider what else your body is managing at the same time.
Keeping a simple record of symptoms, sleep, meals, hydration, activity, menstrual cycle changes and environmental factors may help you recognise patterns over time.
The purpose of tracking isn't to become fearful of everyday activities or to avoid everything that could potentially trigger symptoms.
It's to better understand your body and make informed decisions that support your capacity and quality of life.
Your Body Isn't the Enemy
Something I've come to understand through both my personal experience with POTS and my work as a naturopath is that managing this condition isn't always about doing more.
Sometimes it's about understanding what your body is responding to, recognising its current limitations and finding ways to support it without continually pushing beyond its capacity.
Your body isn't deliberately working against you.
It's trying to maintain balance within a system that's having difficulty regulating circulation and autonomic responses.
And while understanding your triggers won't eliminate every flare, it can give you more insight into why symptoms change and what strategies may help.
Progress with POTS isn't always linear, and experiencing a flare doesn't erase the progress you've made.
How I Approach POTS Management
Understanding your POTS triggers is just one part of managing the condition.
In my practice, I use a four-stage approach: Assess, Stabilise, Support and Build.
We start by looking at the bigger picture, including your symptoms, potential triggers, medical history and the different physiological factors that may be contributing to how you're feeling.
From there, the focus is on identifying ways to support stability, addressing individual needs and gradually building capacity at a pace your body can tolerate.
Because managing POTS isn't about pushing through symptoms or expecting your body to do more than it's currently capable of.
It's about understanding what's happening physiologically, working with your body rather than against it, and developing an individualised approach that supports your long-term wellbeing.
Looking for Support With POTS?
As a degree-qualified naturopath specialising in POTS and complex nervous system conditions, I combine clinical knowledge with my own lived experience of navigating POTS.
My approach focuses on understanding individual triggers, supporting symptom management and building capacity at a sustainable pace.
Whether you've been diagnosed with POTS or are still trying to understand your symptoms, support should be individualised and work alongside appropriate medical care.
Book a Free Connection Call to explore how I may be able to support you.
Disclaimer: This article is intended for general education and does not replace individual medical advice, diagnosis or treatment. POTS management should be tailored to your individual health needs in consultation with appropriately qualified healthcare professionals.