A POTS flare can hit fast, leaving you dizzy, exhausted, and struggling to stay upright. The most effective immediate steps are drinking a large glass of water with added salt, lying down with your legs elevated, and using physical muscle-tensing techniques to push blood back toward your heart. Beyond those first few minutes, several strategies can shorten a flare and reduce how often they happen.
Why Flares Happen in the First Place
POTS symptoms spike when not enough blood returns to your heart after you stand up. Your body compensates by racing your heart rate, sometimes 30 or more beats per minute above your resting rate. One key driver is low blood volume. Research measuring blood volume in POTS patients found a direct relationship: the lower someone’s blood volume, the higher their heart rate climbed upon standing. In people with POTS, blood pressure control depends more heavily on heart rate than it does in healthy individuals, which is why even mild dehydration or blood volume drops can trigger a noticeable flare.
Heat, large meals, prolonged standing, illness, menstrual cycles, and poor sleep are common flare triggers. Understanding the underlying mechanism helps explain why the strategies below work: they all aim to increase the amount of blood circulating back to your heart.
Fluid and Salt Loading
Increasing fluid and salt intake is the single most recommended lifestyle change for POTS. The goal is to expand your blood volume so your cardiovascular system has more to work with when you stand. For most POTS subtypes, a baseline target of about two liters of fluid per day is typical, though during a flare you may need more.
Salt recommendations from major cardiology organizations range widely. The American Society of Hypertension suggests 2,400 to 4,000 mg of sodium per day for people with orthostatic disorders, while a Heart Rhythm Society expert consensus statement recommends 4,000 to 4,800 mg of sodium daily for POTS patients. For context, the average American consumes around 3,400 mg, so most people with POTS need to actively add salt beyond what they’d normally eat. A practical approach is adding 1,000 to 2,000 mg of sodium to your diet three times per day through salted foods, electrolyte drinks, or salt tablets.
One gram of table salt contains about 393 mg of sodium, so five grams of salt (roughly one teaspoon) gives you just under 2,000 mg of sodium. During a flare, drinking 16 ounces of water with an electrolyte mix or a pinch of salt can provide relief within 15 to 30 minutes. Keep electrolyte packets or salt tablets accessible so you’re not scrambling when symptoms hit. Note that the hyperadrenergic subtype of POTS may require different sodium guidance, so this is worth discussing with your doctor if you haven’t already.
Physical Counter-Pressure Maneuvers
When you feel a flare coming on, specific muscle-tensing movements can buy your circulation time. These are called counter-pressure maneuvers, and they work by squeezing your skeletal muscles to physically push pooled blood back toward your heart. A meta-analysis found these movements raised standing systolic blood pressure by nearly 15 mmHg on average, which is enough to meaningfully reduce dizziness and presyncope.
The most effective options include:
- Leg crossing with tensing: Cross your legs at the ankles while standing and squeeze your thigh and calf muscles simultaneously.
- Squatting: Drop into a low squat, which compresses your leg veins and rapidly returns blood upward. When standing back up, combine it with leg or lower-body tensing to avoid a rebound drop.
- Calf raises and marching in place: Repeatedly rising onto your toes or lifting your knees activates the muscle pump in your calves.
- Hand gripping and arm tensing: Clench your fists hard or grip a ball while tensing your arms. This raises blood pressure through upper-body muscle activation.
One important caution: avoid straining or holding your breath during these movements. Bearing down (like pushing during a bowel movement) increases pressure inside your chest and actually reduces blood flow back to your heart, making symptoms worse.
Compression Garments That Actually Work
Not all compression is equally helpful for POTS. Research shows that knee-high compression socks offer only minimal reduction in heart rate and symptoms. What makes a real difference is compression that covers your abdomen, buttocks, and thighs. Waist-high compression tights or abdominal shapewear at 20 to 30 mmHg or 30 to 40 mmHg pressure ratings are the current recommendation.
The reason is anatomy. A large portion of your blood pools in the splanchnic veins (the blood vessels around your gut and pelvis) when you stand. Knee-high socks miss this entire region. Waist-high garments compress the biggest pooling zone, which is why they reduce both heart rate and symptoms more effectively. During a flare, pulling on abdominal compression can provide noticeable relief, though many people find wearing them preventively throughout the day works better than trying to wrestle into tight garments while already symptomatic.
How Meals Can Trigger or Calm a Flare
Eating, especially carbohydrate-heavy meals, can worsen POTS symptoms significantly. When you eat, your gut releases hormones that widen blood vessels in the digestive area to absorb nutrients. One of these hormones, released in response to glucose, can double blood flow to the gut. That blood has to come from somewhere, and it comes at the expense of circulation to your brain and upper body. Research found that this glucose-triggered hormone peaks at the same time orthostatic tachycardia worsens after eating, and the heart races faster because your stroke volume (the amount of blood pumped per heartbeat) drops.
The practical takeaway: eat smaller, more frequent meals rather than two or three large ones. Reduce simple carbohydrates like white bread, sugary drinks, and pasta in favor of meals with more protein, fat, and fiber, which trigger less of that vasodilatory hormone release. Many people with POTS find that their worst flare window is 30 to 90 minutes after a meal. Staying seated or reclined during that period, and avoiding standing tasks right after eating, can prevent postprandial flares.
Managing Heat Exposure
Heat is one of the most reliable POTS triggers because warm temperatures dilate blood vessels, worsening the blood-pooling problem. Cooling strategies are widely used, though the evidence is still limited. Cooling vests, cold towels on the neck, and portable fans are common options. A recent study tested a wrist-worn cooling device on POTS patients and found it improved how patients rated their temperature-related quality of life, but it did not significantly change their heart rate upon standing.
That doesn’t mean cooling is useless during a flare. It likely helps with comfort, brain fog, and the subjective feeling of overheating even when measurable heart rate changes are modest. Practical cooling strategies during a flare include moving to an air-conditioned space, applying cold packs to your neck or wrists, drinking ice water, and avoiding hot showers (or sitting on a shower chair with cooler water). Prevention matters more than rescue here: planning outdoor activities for cooler parts of the day and pre-cooling before heat exposure can help you avoid triggering a flare in the first place.
Positioning and Rest During a Flare
When a flare hits hard, the simplest and most effective thing you can do is get horizontal. Lying down eliminates the gravitational challenge that drives POTS symptoms. Elevating your legs above heart level further helps by encouraging blood to return from your lower body. If you can’t lie down, sitting with your knees pulled up toward your chest mimics some of the same effect.
Many people push through flares out of obligation or embarrassment, but staying upright during a severe episode forces your body to sustain a high heart rate, which can prolong the flare and deepen fatigue afterward. Giving yourself even 10 to 15 minutes of reclined rest with fluids and salt can shorten recovery time substantially. If you deal with frequent flares, having a plan for where and how you can lie down in different settings (work, school, public spaces) removes the decision-making burden when you’re already symptomatic.
Building a Flare Kit
Keeping a small kit with you reduces the scramble when symptoms spike unexpectedly. Useful items include electrolyte packets or salt tablets, a water bottle, a portable fan or cooling towel, compression garments if you’re not already wearing them, and a snack that’s high in protein and low in simple carbs. Some people also carry a small spray bottle for misting their face and neck.
Over time, tracking your flares in a journal or app helps you identify personal patterns. You may notice that flares cluster around specific triggers like heat, menstrual timing, skipped meals, or poor sleep. Recognizing those patterns lets you front-load your strategies (extra salt and fluid the night before a known trigger, for example) instead of always playing catch-up once symptoms have already started.