Heart Rate Too High? Why Your Heart Is Racing & Medically Approved Steps to Take

Your heart rate naturally rises and falls throughout the day. It speeds up when you exercise, feel stressed, drink caffeine, or even get excited. But if your heart rate feels unusually fast, pounding, or out of control, it's normal to wonder: Is this serious?

A fast heart rate—also called tachycardia—can be harmless in some cases and more concerning in others. Understanding what's normal, what's not, and what to do next can help you stay calm and take the right steps.

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What Is a Normal Heart Rate?

For most adults, a normal resting heart rate falls between:

• 60 to 100 beats per minute (bpm)

Athletes and very fit individuals may have resting heart rates below 60 bpm without any problem.

Your heart rate naturally increases when you:

• Exercise
• Feel anxious or stressed
• Drink caffeine or alcohol
• Have a fever
• Experience pain
• Become dehydrated

During physical activity, it's completely normal for your heart rate to rise well above 100 bpm.

The concern usually comes when your heart rate is over 100 bpm at rest, or if it feels irregular, pounding, or accompanied by other symptoms.

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Why Is My Heart Rate So High?

There are many possible reasons your heart rate might be elevated. Some are temporary and harmless. Others may require medical attention.

Common, Non-Dangerous Causes

• Stress or anxiety
• Caffeine or energy drinks
• Nicotine
• Dehydration
• Lack of sleep
• Fever or infection
• Certain medications (like decongestants or asthma inhalers)

In these cases, the heart rate often returns to normal once the trigger is removed.

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Medical Causes of a High Heart Rate

Sometimes, a consistently high heart rate signals an underlying condition, such as:

• Anemia (low red blood cells)
• Thyroid disorders (especially hyperthyroidism)
• Heart rhythm disorders (arrhythmias)
• Low blood pressure
• Heart disease
• Electrolyte imbalances
• Lung conditions
• Blood clots (rare but serious)

A condition called supraventricular tachycardia (SVT) can cause sudden episodes of very rapid heart rate, often starting and stopping abruptly.

Another serious rhythm problem, atrial fibrillation (AFib), can cause a fast and irregular heart rate, particularly in older adults.

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When Should You Be Concerned?

A fast heart rate is more concerning if it comes with other symptoms.

Seek immediate medical attention if your racing heart is accompanied by:

• Chest pain or pressure
• Shortness of breath
• Fainting or near-fainting
• Severe dizziness
• Confusion
• Sweating with nausea
• Pain spreading to the arm, jaw, or back

These could be signs of a heart attack, dangerous arrhythmia, or another serious condition.

Even if symptoms are milder, you should speak to a doctor if:

• Your resting heart rate is consistently above 100 bpm
• You notice frequent unexplained episodes
• Your heart rhythm feels irregular
• You have a history of heart disease

Do not ignore persistent changes in your heart rate.

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How to Check Your Heart Rate Properly

You can measure your heart rate by:

1. Placing two fingers on your wrist (thumb side) or neck.
2. Counting beats for 30 seconds.
3. Multiplying by two.

You can also use:

• A smartwatch or fitness tracker
• A home blood pressure monitor
• A pulse oximeter

Check your heart rate when you're relaxed and seated for the most accurate resting reading.

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Medically Approved Steps to Lower a High Heart Rate

If your heart rate is elevated and you do not have emergency symptoms, try these evidence-based strategies:

1. Slow, Deep Breathing

Controlled breathing activates your parasympathetic nervous system (your body's "calm down" system).

Try this:

• Inhale slowly for 4 seconds
• Hold for 4 seconds
• Exhale for 6 seconds
• Repeat for several minutes

This can significantly lower stress-related heart rate increases.

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2. Hydrate

Dehydration forces your heart to work harder. Drink water and avoid caffeine or alcohol if your heart is racing.

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3. Sit or Lie Down

If you've been active, stop and rest. Sudden standing after sitting can also raise your heart rate temporarily.

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4. Reduce Stimulants

Cut back on:

• Coffee
• Energy drinks
• Nicotine
• Certain cold medications

These are common triggers of elevated heart rate.

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5. Manage Stress Long-Term

Chronic stress keeps your heart rate elevated. Consider:

• Regular exercise
• Meditation
• Therapy or counseling
• Improved sleep habits

These approaches are strongly supported by medical research for improving heart health.

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6. Vagal Maneuvers (If Recommended by a Doctor)

In certain rhythm disorders like SVT, doctors may recommend techniques such as:

• Bearing down as if having a bowel movement
• Splashing cold water on your face

These should only be used if a healthcare provider has explained them to you.

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Could Anxiety Be Causing It?

Yes. Anxiety and panic attacks can cause:

• Rapid heart rate
• Chest tightness
• Sweating
• Shaking
• Shortness of breath

The symptoms can feel very real and intense.

However, anxiety should only be assumed after more serious medical causes are ruled out—especially if this is new or different for you.

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Should You Do a Symptom Check?

If you're unsure what's causing your rapid heartbeat or whether you need to see a doctor, using Ubie's free AI-powered fast beating heart symptom checker can help you understand potential causes and guide you on the right next steps based on your specific symptoms.

Keep in mind, though, that online tools are informational and do not replace a medical evaluation.

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Long-Term Heart Rate Health

Keeping your heart rate in a healthy range over time lowers your risk of heart disease.

Here are medically supported ways to protect your heart:

• Exercise at least 150 minutes per week
• Maintain a healthy weight
• Control blood pressure
• Manage blood sugar
• Avoid smoking
• Limit alcohol
• Get quality sleep

A lower resting heart rate over time is often a sign of improved cardiovascular fitness.

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The Bottom Line

A high heart rate can be completely normal—or it can signal a medical issue. Context matters.

It's often harmless if it's related to exercise, stress, or caffeine and resolves quickly. But persistent, unexplained, or symptomatic fast heart rates deserve medical attention.

Do not ignore:

• Ongoing resting heart rate above 100 bpm
• Irregular rhythm
• Chest pain
• Fainting
• Severe shortness of breath

If anything feels severe, sudden, or life-threatening, seek emergency care immediately.

When in doubt, speak to a doctor. A simple exam, blood test, or heart rhythm test (like an ECG) can often quickly determine the cause.

Your heart works nonstop for you. Paying attention to changes in your heart rate—and acting appropriately—can protect your long-term health without unnecessary panic.