POTS can be associated with temperature sensitivity, especially worsening symptoms with heat, and some people also feel unusually cold. The autonomic nervous system helps control sweating, blood vessel responses, and body temperature. When these responses do not work smoothly, temperature changes may make dizziness, a racing heart, weakness, or fatigue more noticeable. Temperature sensitivity alone, however, does not establish that someone has POTS.
How can POTS affect temperature regulation?
Postural orthostatic tachycardia syndrome (POTS) is a condition that affects the body's response to standing upright. People with POTS may experience a faster-than-expected heart rate along with symptoms such as lightheadedness, fatigue, and palpitations. The condition is associated with changes in how the autonomic nervous system regulates circulation.
The autonomic nervous system also controls functions that happen automatically, including sweating, blood vessel activity, and body temperature regulation. According to Johns Hopkins Medicine, this system plays an important role in controlling heart rate, blood pressure, sweating, and body temperature. Because these processes overlap, some people with POTS have difficulty tolerating changes in their environment.
Temperature sensitivity may involve feeling overheated when a room is warm, becoming uncomfortable during a hot shower, or struggling to stay warm when others feel comfortable. Some people experience fluctuations throughout the day. Others mainly notice symptoms in hot weather. These experiences can differ even among people who have the same condition.
Why does heat make POTS symptoms worse?
Heat is a recognized trigger for POTS symptoms. When the body needs to release heat, blood vessels near the skin widen. This helps the body cool down, but it can also affect circulation. In someone who already has difficulty regulating heart rate and blood flow while upright, these changes may make existing symptoms more noticeable.
According to the Cleveland Clinic, warm environments, hot baths, hot showers, and hot outdoor conditions can trigger or worsen POTS symptoms. Heat may be particularly difficult when a person is standing for a long time or has not consumed enough fluids.
For example, someone may feel relatively comfortable while sitting in an air-conditioned room but become dizzy, weak, or unusually tired after standing in a warm kitchen. A hot shower may also cause a racing heart, sweating, or lightheadedness. These experiences can make routine activities harder to manage, particularly during hot weather.
Common situations that may trigger symptoms
- Hot or humid weather, especially when spending time outdoors.
- Hot baths, showers, saunas, or poorly ventilated bathrooms.
- Warm rooms without adequate air circulation.
- Standing for extended periods in a warm environment.
- Exercise or other activities that increase body heat.
- Illness or inadequate fluid intake, which may make symptoms more difficult to manage.
These are possible triggers rather than a checklist for identifying POTS. A person's response depends on their health, environment, and other factors that affect circulation and temperature control.
Can POTS also cause sensitivity to cold?
Yes. Although heat-related symptom flares receive particular attention in POTS guidance, some people report difficulty staying warm, feeling unusually cold, or experiencing changes between feeling hot and cold. Others mainly experience heat intolerance and have little trouble in cooler conditions.
PoTS UK explains that people with POTS may have different temperature-regulation difficulties: some struggle to keep cool, others struggle to keep warm, and some experience fluctuations throughout the day. The exact reasons for these experiences are not fully established, and the presence of cold sensitivity does not necessarily mean that POTS is responsible.
Feeling cold may also occur for reasons unrelated to POTS, including anemia, an underactive thyroid, or problems affecting blood vessels. If cold sensitivity is new, persistent, or unusual for you, a healthcare professional can help determine whether another explanation needs to be considered.
What can help with temperature sensitivity when you have POTS?
Keeping your surroundings at a comfortable, relatively consistent temperature may help reduce temperature-related symptom flares. The aim is not to eliminate every temperature change but to make everyday activities more manageable while avoiding conditions that repeatedly worsen symptoms.
Dysautonomia International recommends practical environmental adjustments for people with POTS, including maintaining an even temperature and using cooling measures when needed. Options can be adapted to your own symptoms and living conditions.
- Keep your environment comfortable. Use air conditioning, a fan, or a cooler room during hot weather when available.
- Choose light, breathable clothing. Wear layers that can be added or removed when your temperature comfort changes.
- Adjust shower temperature. Lukewarm water may be easier to tolerate than very hot or very cold water. A shower chair may also help if standing makes you dizzy.
- Plan outdoor activities carefully. Consider cooler times of day and take breaks in a shaded or air-conditioned place.
- Follow an individualized fluid plan. Dehydration can worsen POTS symptoms, but the appropriate amount of fluid and salt depends on your health and treatment plan. Ask your clinician what is suitable for you.
- Respond promptly to dizziness. Sit or lie down somewhere safe if you feel faint, and avoid continuing an activity that could cause a fall.
Very cold conditions can also be uncomfortable for some people, so avoid assuming that extreme cooling is always helpful. Choose a temperature that feels comfortable and change your environment gradually when practical.
When should temperature sensitivity be checked by a healthcare professional?
Temperature sensitivity can occur with POTS, but it can also have other causes. According to MedlinePlus, heat intolerance may be associated with certain medicines and health conditions, including thyroid disorders. Persistent or unexplained difficulty tolerating heat should therefore be discussed with a healthcare professional rather than automatically attributed to POTS.
Consider arranging a medical assessment if temperature sensitivity is new, worsening, interfering with daily activities, or accompanied by recurring dizziness, fainting, unusual sweating, palpitations, or weakness. A clinician may review your medical history, current medicines, symptoms, and the situations in which they occur. Depending on the findings, an examination or tests may be needed to investigate other possible explanations.
POTS symptoms can also worsen during an infection or another illness. A measured fever, particularly with new or worsening symptoms, should not automatically be blamed on temperature sensitivity or POTS. Seek urgent medical attention for signs of a heat-related emergency, such as confusion, collapse, or altered consciousness after heat exposure, or for new severe chest pain or serious difficulty breathing.
Does temperature sensitivity mean POTS is getting worse?
Not necessarily. A temporary increase in symptoms during hot weather may reflect a familiar environmental trigger rather than a lasting change in the underlying condition. However, new patterns, increasingly frequent episodes, or symptoms that interfere more with normal activities deserve attention. Keeping a brief record of the weather, activities, symptoms, and any relevant fluid intake can help your healthcare professional identify patterns and review your management plan.
Can treating POTS improve temperature tolerance?
Managing POTS may help make temperature-related symptoms easier to handle, although there is no single approach that works for everyone. Treatment plans may include individualized changes to fluid intake, medication when appropriate, and other measures that address symptoms and circulation. Practical cooling or warming strategies can complement this care, but temperature sensitivity may not disappear completely. Discuss persistent difficulties with your healthcare professional so your management plan can be reviewed.