Recurring heart palpitations are most often caused by stress, caffeine, hormonal shifts, or electrolyte imbalances, not a heart problem. That fluttering, pounding, or skipped-beat sensation can feel alarming, but the vast majority of palpitations are harmless. Understanding what’s triggering yours is the key to making them stop.
Stress and Anxiety Are the Most Common Cause
Anxiety is the single most frequent reason people experience palpitations. When you’re stressed or anxious, your body releases adrenaline, which speeds up your heart rate and makes you hyper-aware of each beat. This creates a feedback loop: you feel a palpitation, it scares you, the fear produces more adrenaline, and the palpitations continue.
What makes this tricky is that you don’t need to feel obviously anxious for stress to be the culprit. Chronic low-grade stress, poor sleep, and even subconscious tension can keep your nervous system revved up enough to produce palpitations throughout the day. If your palpitations tend to cluster during busy periods, before bed when your mind races, or during moments of emotional intensity, stress is the likely driver.
Caffeine, Alcohol, and Other Triggers
Caffeine in normal amounts (a few cups of coffee or tea) doesn’t increase the risk of abnormal heart rhythms for most people. But some individuals are simply more sensitive. If you’ve noticed palpitations after your morning coffee or an energy drink, you’re likely one of them. Energy drinks with high caffeine doses are worth avoiding entirely if palpitations are a recurring issue.
Alcohol is a more reliable trigger. Even moderate drinking can provoke palpitations, and for people prone to heart rhythm disturbances, experts recommend limiting intake to no more than three drinks per week. Spicy food, nicotine, and certain medications (decongestants, some asthma inhalers) can also set them off. Keeping a simple log of what you consumed before each episode can help you identify your personal triggers surprisingly fast.
Low Magnesium or Potassium
Your heart’s electrical system depends on a precise balance of minerals, particularly potassium and magnesium. When levels of either drop too low, the electrical signals that coordinate each heartbeat become unstable. This can show up as skipped beats, fluttering, or a racing sensation.
You don’t need a dramatic deficiency for this to matter. Mild drops in potassium or magnesium, common after heavy sweating, diarrhea, diuretic use, or simply not eating enough fruits and vegetables, can be enough to trigger noticeable palpitations. If your diet is low in leafy greens, nuts, bananas, or potatoes, that’s worth addressing before looking for more complicated explanations.
Hormonal Changes
Palpitations are strikingly common during perimenopause and menopause. Fluctuating estrogen levels directly affect how the heart’s electrical system behaves, and many women experience a racing heart or fluttering that seems to come out of nowhere during this transition. Pregnancy and the teenage years can produce palpitations for similar hormonal reasons.
For menopausal palpitations specifically, reducing caffeine, alcohol, and smoking can make a meaningful difference. Swapping one or two caffeinated drinks for decaf, or cutting back from four cups to three, is often enough to notice improvement. These same lifestyle changes tend to reduce hot flushes as well, since the underlying hormonal sensitivity drives both symptoms.
What’s Actually Happening in Your Heart
Most palpitations are caused by extra heartbeats called premature contractions. These are beats that fire slightly early, followed by a brief pause before the next normal beat. That pause, and the stronger-than-usual beat after it, is what you feel as a “skip” or “thud.”
These extra beats can originate in the upper chambers of the heart (called PACs) or the lower chambers (called PVCs). Both are extremely common. Nearly everyone has them, though not everyone notices. They become more noticeable when you’re lying still, when your heart rate is slow, or when you’re already anxious and paying close attention to your body.
The important threshold is how many of these extra beats you’re having relative to your total heartbeats in a day. If premature beats make up less than 5% of your daily heartbeats, they’re considered benign and typically need no treatment at all. Above 10%, there’s a possibility they could strain the heart over time, and doctors will usually want to address them.
Thyroid Problems and Other Medical Causes
An overactive thyroid is one of the most commonly overlooked causes of persistent palpitations. Excess thyroid hormone directly alters the electrical channels in heart cells, changing how quickly they fire and how they recover between beats. It also ramps up parts of the heart’s stress-response system, making palpitations more frequent and more forceful. A simple blood test can rule this out, and it’s worth requesting if your palpitations are new, persistent, or accompanied by weight loss, heat intolerance, or trembling hands.
Other medical conditions that can cause recurring palpitations include anemia (your heart beats harder to compensate for low oxygen-carrying capacity), dehydration, low blood sugar, and structural heart problems like valve abnormalities. People with existing heart disease or significant risk factors for it are more likely to have palpitations tied to an actual rhythm disorder rather than a benign cause.
How Doctors Figure Out the Cause
The challenge with palpitations is that they often aren’t happening when you’re sitting in the doctor’s office. A standard EKG captures only a few seconds of your heart’s activity, so it frequently misses intermittent episodes. If your palpitations come and go, your doctor will likely suggest a portable heart monitor.
A Holter monitor is the most common option. You wear a small recording device for 24 to 48 hours while going about your normal routine, and it captures every heartbeat during that window. If your episodes are less frequent, an event monitor works better. You wear it for several weeks to a full month, pressing a button when you feel symptoms so the device records what your heart was doing at that exact moment. The goal is to match what you feel with what’s actually happening electrically, which tells your doctor whether the palpitations are premature contractions, a faster rhythm, or something else entirely.
When Palpitations Need Urgent Attention
Most palpitations don’t require emergency care, but certain combinations of symptoms do. A sudden collapse or loss of consciousness alongside palpitations means calling emergency services immediately. Palpitations paired with dizziness or lightheadedness, especially if you feel like you might faint, also warrant an emergency department visit. Chest pain occurring with palpitations should be treated the same way.
Outside of those red flags, palpitations that are becoming more frequent, lasting longer, or happening during exercise rather than at rest are worth bringing up with your doctor, even if they don’t feel like emergencies. The pattern matters. Occasional flutters at rest that last a few seconds are almost always harmless. Episodes lasting minutes, happening daily, or interrupting your ability to function tell a different story and deserve investigation.