It usually happens when things are quiet. You’re lying in bed, or sitting at your desk, or halfway through your second cup of chai, and suddenly your heart does something odd. A thump. A flutter. A skipped beat followed by a hard one. Maybe it races for ten seconds and then settles as if nothing happened.
Your first thought is rarely calm. Is this my heart? Am I having a heart attack? Or am I just stressed?
If that sounds familiar, take a breath. Heart palpitations are one of the most common reasons people walk into a doctor’s office, and in the large majority of cases they turn out to be harmless. But “most of the time” isn’t “always,” and that’s exactly why the question in the title is worth taking seriously.
This article explains what palpitations actually are, how anxiety and caffeine trigger them, which other causes people overlook, and the specific warning signs that mean you shouldn’t wait it out.
What are heart palpitations, exactly?
Palpitations aren’t a disease. They’re a sensation: becoming aware of your own heartbeat. Most of the time you don’t feel your heart at all. When you do, people describe it in different ways:
- A pounding or thumping in the chest
- A fluttering, like a bird or a fish moving around
- A skipped or “missed” beat
- A racing heart that comes on suddenly
- A heartbeat you can feel in your throat or neck
The feeling can last a few seconds or several minutes, and it can come in the chest, throat or neck. Sometimes your heart really is beating too fast, too slowly or irregularly. Other times the rhythm on a monitor looks perfectly normal, and you’re simply noticing a normal heartbeat more than usual, particularly when you’re anxious or lying on your left side.
The NHS guide to heart palpitations is a clear starting point if you want a plain-English overview.
The extra beat that scares everyone
One thing worth knowing early: the most common cause of that “skipped beat” feeling isn’t a skipped beat at all.
It’s usually an ectopic beat, a heartbeat that comes slightly early. The heart then pauses briefly before the next one, and that following beat is stronger because the chamber has had extra time to fill. What you feel is the big thump, not the early beat, and it can feel like your heart stopped and restarted.
Ectopic beats (doctors call them premature atrial or ventricular contractions) are extremely common. Many people have them every day without ever noticing. In people with otherwise healthy hearts, they’re typically benign. The trouble is that once you notice them, you tend to keep noticing them, and that makes you anxious, which makes more of them happen. It’s a loop.
Cause 1: Anxiety and stress
Anxiety is one of the most frequent triggers, and the connection isn’t imaginary or “all in your head” in the dismissive sense. When you’re anxious or stressed, your body releases adrenaline and related hormones. Heart rate and blood pressure rise, and the heart beats harder. You feel it, and that physical sensation is real.
A panic attack can be particularly convincing. People describe a pounding heart, chest tightness, breathlessness, sweating, trembling and a sense of doom. It can feel exactly like a heart problem, which is why many first-time panic attacks end in an emergency department visit. The NHS page on panic disorder describes what it feels like and how it’s treated.
Clues it may be anxiety:
- It comes during or after stressful moments, or when you’re worrying
- You also have a tight chest, tingling fingers, shaky hands or breathlessness
- It passes as you calm down
- You’ve noticed it more during a rough patch in life
Two important notes. First, a feeling of anxiety doesn’t rule out a heart problem, and a heart problem can cause anxiety. A doctor should still check, especially the first time. Second, if anxiety is behind your palpitations, treating it properly (therapy, breathing practice, exercise, and sometimes medication) can help a great deal. It’s a real, treatable condition, not a character flaw.
Cause 2: Caffeine and other stimulants
Caffeine is a stimulant. In some people, even moderate amounts can bring on a racing heart, extra beats or jitteriness. Sensitivity varies a lot from person to person, and it can change over time. Someone who drank five cups of tea a day for years might suddenly find that two now sets their heart off.
In India, the caffeine count adds up quickly if you don’t think about it. Strong chai several times a day, filter coffee, cold coffee, cola, and energy drinks all count. Energy drinks deserve special mention, because some contain very high caffeine doses on top of other stimulants such as taurine and guarana, and teenagers and young adults often drink them without thinking.
The US Food and Drug Administration says that for most healthy adults, up to about 400 milligrams of caffeine a day is not generally associated with negative effects, but it also notes that people vary in how sensitive they are. Their consumer guidance on caffeine is worth reading if you aren’t sure how much you’re consuming.
Other stimulants and triggers to look at:
- Nicotine in cigarettes, beedis, vapes and tobacco products
- Alcohol, especially heavy drinking or binges (some people get palpitations the morning after)
- Decongestants such as pseudoephedrine and phenylephrine found in many cold remedies
- Some asthma inhalers and other medicines
- Weight-loss supplements and pre-workout powders, which often contain hidden stimulants
- Recreational drugs, including cocaine and amphetamines
A simple test: if you suspect caffeine, cut back gradually over a week or two (stopping suddenly can cause headaches) and see what happens. If your symptoms ease, you’ve probably found a contributor.
Cause 3: Everyday triggers people forget
Sometimes there’s no single culprit, just a pile-up of small ones. Poor sleep, dehydration, skipped meals, hot weather, a big heavy meal, intense exercise, and hormonal changes can all make you more aware of your heartbeat.
Hormones deserve a mention. Many women notice palpitations at certain times in their cycle, during pregnancy (when blood volume and heart rate naturally rise), or in the years around menopause. These are common and usually harmless, but they’re still worth mentioning to your doctor.
Cause 4: Medical conditions outside the heart
This is the category that catches people out, because the problem isn’t in the heart itself. Several conditions can cause a fast or noticeable heartbeat:
- Anaemia. When there’s less oxygen-carrying capacity in the blood, the heart works harder to compensate. Iron deficiency is very common in India, particularly among women. The NHS page on iron deficiency anaemia lists the symptoms.
- An overactive thyroid. Too much thyroid hormone speeds the body up, causing a fast heartbeat, weight loss, sweating, trembling and anxiety-like symptoms. A simple blood test can detect it, and the NHS overview of an overactive thyroid explains the signs.
- Low blood sugar, particularly in people with diabetes on certain medicines
- Low potassium or magnesium, which can follow severe diarrhoea, vomiting or some diuretics
- Fever and infection, since heart rate naturally rises when you’re unwell
- Dehydration or blood loss
- Low blood pressure or standing up too quickly
If your palpitations are new or persistent, blood tests for anaemia, thyroid function and electrolytes are often among the first things a doctor will order. It’s a good reminder that palpitations aren’t always about the heart.
Cause 5: Heart rhythm problems
Now for the part that deserves respect. Sometimes palpitations come from an actual abnormal heart rhythm, called an arrhythmia. There are many types. A few of the better-known ones:
Atrial fibrillation (AF). The upper chambers of the heart quiver chaotically instead of beating in a coordinated way, causing an irregular, often fast pulse. It becomes more common with age, and it matters because it raises the risk of stroke. People may feel palpitations, tiredness or breathlessness, though some have no symptoms at all. The NHS information on atrial fibrillation explains how it’s diagnosed and managed.
Supraventricular tachycardia (SVT). A sudden burst of a very fast, regular heartbeat, often starting and stopping abruptly. It frequently affects younger people and is usually not dangerous, though it’s unpleasant and should be evaluated.
Ventricular arrhythmias. These start in the lower chambers and can be more serious, particularly in people with existing heart disease or a family history of sudden cardiac death.
The American Heart Association’s information on arrhythmia gives a good general overview of the different types, symptoms and tests.
Other heart-related causes include valve problems, heart muscle disease (cardiomyopathy), coronary artery disease, and past heart attacks. These are less likely in a young, otherwise healthy person, but the risk climbs with age, diabetes, high blood pressure, high cholesterol, smoking and family history. Heart disease starts earlier in many South Asian populations than in other groups, which is another reason not to dismiss new symptoms.
How to tell the difference
No article can diagnose you, and there’s no reliable way to tell an anxious heart from a rhythm disorder by feel alone. But some patterns offer clues.
More likely to be benign:
- Brief flutters or single skipped beats
- Triggered by caffeine, stress, poor sleep or alcohol
- Occurs when you’re resting and you’re otherwise well
- No other symptoms
- Happens occasionally and settles on its own
More worrying features:
- A sustained, very fast heartbeat that doesn’t settle
- A completely irregular rhythm for minutes or hours
- Palpitations during exercise
- Accompanied by chest pain, breathlessness, dizziness or fainting
- A family history of sudden death or inherited heart conditions
- Known heart disease, or multiple risk factors
- New palpitations in someone older, especially with other symptoms
Red flags: when to get help immediately
Call your local emergency number (112 in India, or your local ambulance service) or go to the nearest emergency department if palpitations come with:
- Chest pain, pressure or tightness
- Severe shortness of breath
- Fainting or nearly fainting
- Severe dizziness or confusion
- Weakness or numbness on one side of the body, or difficulty speaking (possible stroke)
- Pain spreading to the arm, jaw, neck or back
The NHS page on heart attacks lists the warning signs. Don’t drive yourself if you feel unwell.
Book a routine appointment soon (not an emergency) if you have palpitations that happen repeatedly, last longer than a few minutes, are new for you, or worry you enough to affect your daily life. You don’t need to wait for something dramatic to happen.
What the doctor will actually do
It helps to know what to expect, because the unknown makes it scarier.
- Questions. When it happens, how long it lasts, whether it’s regular or irregular, what you were doing, your caffeine, alcohol and medicines, and your family history.
- Examination. Pulse, blood pressure, and listening to your heart.
- An ECG. A quick recording of your heart’s electrical activity. It’s painless. The catch is that if your palpitations aren’t happening during the test, it may look normal.
- Blood tests. To check for anaemia, thyroid problems, electrolytes and sometimes blood sugar.
- Longer monitoring. A Holter monitor records your heart for 24 to 48 hours or longer, and event recorders or patches can be worn for weeks if symptoms are infrequent.
- An echocardiogram. An ultrasound of the heart to look at its structure and function.
- A stress test, if palpitations happen with exertion.
Many people are relieved to hear that their tests are normal. If that’s you, it can still feel strange to be told nothing is wrong when you can feel something. That’s a valid reaction, and it’s worth asking your doctor what might be driving your symptoms and what you can do about it.
What you can do in the meantime
While you’re waiting for an appointment, or after you’ve been given the all-clear, a few habits can help.
- Keep a symptom diary. Note the date, time, what it felt like, how long it lasted, and what you’d done in the preceding hours. This is some of the most useful information you can give a doctor.
- Check your pulse. Learn how to feel your pulse at the wrist, and note whether it’s regular or irregular and roughly how fast. Many smartwatches can record heart rhythm, which can be helpful, but they aren’t perfect and false alarms are common. Show readings to your doctor rather than relying on them for a diagnosis.
- Cut back on stimulants. Gradually reduce caffeine, energy drinks and nicotine, and keep alcohol modest.
- Sleep and hydrate. Both matter more than people expect.
- Move regularly. Moderate exercise, once cleared by your doctor, supports heart health and eases anxiety.
- Practise slow breathing. Breathing in for four counts and out for six or more, for a few minutes, can help the body settle during an episode.
- Ask before trying manoeuvres. Some doctors teach specific techniques to slow certain fast rhythms. Don’t try unfamiliar techniques without being shown them, especially if you have other medical conditions.
- Avoid obsessive checking. Constant pulse-taking or watching your watch can feed the anxiety loop.
The bottom line
Palpitations are alarming precisely because they involve the heart. But in the large majority of cases they’re caused by things like stress, caffeine, poor sleep, ectopic beats or a treatable problem such as anaemia or an overactive thyroid. A smaller number are due to heart rhythm disorders that need proper treatment, and the key is working out which group you belong to.
So don’t ignore them, and don’t catastrophise either. Notice the pattern, cut the obvious triggers, and see a doctor if they’re frequent, prolonged, new, or come with any warning signs. Sorting it out usually takes a simple ECG and a few blood tests, and the peace of mind alone is worth it.
Disclaimer: This article is for general information and does not replace professional medical advice, diagnosis or treatment. If you think you’re having a medical emergency, call your local emergency number immediately.
Sources and further reading
- NHS: Heart palpitations
- NHS: Atrial fibrillation
- NHS: Panic disorder
- NHS: Overactive thyroid
- NHS: Iron deficiency anaemia
- NHS: Heart attack
- American Heart Association: Arrhythmia
- US FDA: How much caffeine is too much?
