3. Dizziness or fainting
A rapid or abnormal heart rhythm can sometimes reduce the amount of blood reaching the brain.
This may cause dizziness, blurred vision, weakness, or a sensation that you are about to faint.
Actual fainting, especially when accompanied by palpitations, is a particularly important warning sign.
Seek urgent medical assessment rather than assuming that the episode was caused by standing up too quickly.
4. A rapid heartbeat that does not settle
A heartbeat that remains unusually fast while you are resting deserves attention, especially when there is no obvious explanation.
For example, a persistent rapid pulse that occurs without exercise, fever, dehydration, or emotional stress may require medical evaluation.
There is no single duration that makes every episode dangerous. The urgency depends on the heart rate, rhythm, symptoms, medical history, and overall condition.
If the heartbeat is very rapid and accompanied by chest pain, shortness of breath, fainting, or severe weakness, seek emergency care immediately.
5. New or worsening symptoms
People who already experience occasional palpitations should pay attention if the pattern changes.
Examples include:
-
Episodes becoming more frequent.
-
Palpitations lasting longer.
-
A noticeably irregular rhythm.
-
Symptoms appearing during sleep.
-
New dizziness or weakness.
-
Reduced ability to exercise.
-
Swelling in the legs or ankles.
-
Increasing breathlessness.
A change in symptoms may indicate that a new medical problem has developed.
When should you call emergency services?
Seek emergency medical help if a racing heartbeat occurs with:
-
Chest pain or pressure.
-
Severe shortness of breath.
-
Fainting or near-fainting.
-
Severe dizziness or confusion.
-
Collapse or loss of consciousness.
-
Signs of a possible stroke, such as sudden facial weakness, arm weakness, or difficulty speaking.
Do not drive yourself to the hospital if you are experiencing severe symptoms.
If someone collapses and is unresponsive or is not breathing normally, call emergency services immediately and begin CPR if possible.
How doctors investigate a racing heartbeat
If you experience recurring palpitations, a healthcare professional may recommend several tests.
The purpose is to identify whether the heartbeat is responding to a temporary trigger or whether an underlying medical condition is responsible.
1. Medical history and physical examination
The evaluation often begins with questions about your symptoms.
Your doctor may ask:
-
When did the episodes begin?
-
How often do they happen?
-
How long do they last?
-
Do they start suddenly or gradually?
-
Do they occur while sitting, standing, sleeping, or exercising?
-
Do you experience chest pain or dizziness?
-
How much caffeine or alcohol do you consume?
-
What medications and supplements do you take?
-
Do you have a family history of heart disease or sudden cardiac death?
The doctor may also measure your blood pressure, pulse, oxygen level, and temperature.
A physical examination can provide additional information about circulation, heart sounds, and other possible health problems.
2. Electrocardiogram
An electrocardiogram, commonly called an ECG or EKG, records the heart's electrical activity.
It can help identify abnormal rhythms, conduction problems, and certain signs of heart disease.
An ECG is usually quick and painless.
However, a standard ECG records only a short period of time. If your palpitations do not occur during the test, the results may be normal even when an intermittent rhythm problem exists.
3. Holter monitor
A Holter monitor is a portable device that records heart rhythm continuously, often over 24 to 48 hours.
It may be useful for people who experience symptoms frequently.
You usually wear the device while carrying out normal daily activities.
If an episode occurs, you may be asked to record the time and describe what you were doing and how you felt.
4. Event monitor or longer-term heart monitoring
If symptoms happen less frequently, a doctor may recommend a longer monitoring period.
An event monitor records heart rhythm over an extended period and may allow the patient to activate a recording when symptoms occur.
Some wearable devices also provide heart rhythm information, although their results should not replace medical-grade testing when a diagnosis is needed.
5. Blood tests
Blood tests can help identify conditions that may contribute to a fast heartbeat.
Depending on the situation, your doctor may check:
-
Complete blood count to look for anemia.
-
Thyroid function.
-
Electrolytes such as potassium and magnesium.
-
Kidney function.
-
Blood glucose.
-
Other tests based on your symptoms and medical history.
These tests can help identify problems outside the heart that influence cardiovascular function.
6. Echocardiogram
An echocardiogram uses ultrasound to create images of the heart.
It helps doctors assess the size of the heart chambers, the movement of the heart muscle, valve function, and overall pumping ability.
It may be recommended when there is concern about structural heart disease.
7. Additional testing
In selected cases, doctors may recommend an exercise stress test, advanced imaging, or an electrophysiology study.
The choice depends on the suspected condition and the results of earlier investigations.
Not everyone with palpitations needs every test. A healthcare professional determines which investigations are appropriate.
CHAPTER 5: HOW TO SUPPORT A HEALTHY HEART AND REDUCE EPISODES OF PALPITATIONS
The right approach to managing a racing heartbeat depends on its underlying cause.
If the problem is related to dehydration, correcting fluid intake may help. If it is associated with anemia or thyroid disease, treating that condition may reduce symptoms.
If an arrhythmia is responsible, specific medical treatment may be necessary.
Nevertheless, several everyday habits can support cardiovascular health and reduce some common triggers.
1. Review your caffeine consumption
Caffeine affects people differently.
If you frequently experience palpitations after drinking coffee, energy drinks, strong tea, or pre-workout supplements, consider reducing your intake.
You do not necessarily need to eliminate caffeine completely.
Start by identifying how much you consume and whether symptoms appear afterward.
Pay particular attention to energy drinks and products that combine multiple stimulants.
If you have been advised to avoid caffeine because of a heart rhythm problem, follow your healthcare professional's recommendations.
2. Stay adequately hydrated
Maintaining adequate hydration helps support normal blood circulation.
Drink water regularly throughout the day, especially during hot weather or after sweating.
People who exercise, work outdoors, or live in hot climates may need to pay additional attention to fluid intake.
Do not wait until you feel extremely thirsty before drinking.
However, individuals with medical conditions requiring fluid restrictions should follow their prescribed limits.
3. Prioritize consistent sleep
Poor sleep can increase stress and make palpitations more noticeable.
Try to establish a regular sleeping schedule.
Helpful habits include:
-
Going to bed at approximately the same time each night.
-
Limiting caffeine later in the day.
-
Reducing screen exposure before bedtime.
-
Keeping the bedroom cool and comfortable.
-
Avoiding heavy meals immediately before sleeping.
-
Allowing enough time for rest.