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Worried about supraventricular tachycardia?

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This page summarises publicly available NHS information for educational purposes only. It is not medical advice or a diagnosis. Always consult a qualified healthcare professional.

What is supraventricular tachycardia?

Supraventricular tachycardia (SVT) is a sudden episode of abnormally fast heartbeat, often over 120 beats per minute, that starts and stops suddenly. Episodes can last seconds to hours and may cause palpitations, dizziness, or chest discomfort. SVT is usually not dangerous, but persistent or severe episodes should be checked by a GP or cardiologist.

When NHS resources suggest seeing a GP

  • You keep getting a fast heartbeat.
  • It's important to get it checked out. You might need a test, such as an electrocardiogram (ECG), to find out what's going on.
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Self-care information from NHS

  • If your episodes of supraventricular tachycardia (SVT) only last a few minutes and do not bother you, you may not need treatment.
  • You can make changes to your lifestyle to reduce your chances of having episodes, such as.
  • Cutting down on the amount of caffeine or alcohol you drink.
  • Stopping or cutting back on smoking.
  • Your doctor may also be able to recommend some simple techniques to help stop episodes when they happen.

Common questions

How do I stop an SVT episode?

Vagal manoeuvres can sometimes stop an episode — try bearing down (like straining on the toilet), blowing into a closed syringe, or splashing cold water on your face. If episodes are frequent, a cardiologist may suggest medication or a procedure called ablation.

Is SVT dangerous?

SVT is usually not life-threatening, but it can feel alarming. Call 999 if an episode lasts longer than usual, comes with severe chest pain, fainting, or difficulty breathing — these need urgent assessment.

What triggers SVT episodes?

Common triggers include caffeine, alcohol, stress, lack of sleep, and strenuous exercise. Keeping a diary of episodes and triggers can help identify patterns and guide treatment.

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This page is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional about your individual situation. NorMed organises publicly available NHS information and is not affiliated with the NHS.