Sudden episodes of rapid heartbeat
Sudden episodes of rapid heartbeat, or paroxysmal tachycardia, are abrupt increases in heart rate that start and stop without warning. The heart may beat 150-250 times per minute. Episodes can last seconds to hours and may feel frightening.
Conditions that commonly cause sudden episodes of rapid heartbeat
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Common Causes of Sudden episodes of rapid heartbeat
- Supraventricular tachycardia (SVT)
- Atrial fibrillation
- Panic attacks
- Excessive caffeine or stimulant use
- Thyroid overactivity
When to Seek Urgent Medical Care for Sudden episodes of rapid heartbeat
These signs may indicate a serious problem — don't wait, seek medical care right away:
- Rapid heartbeat with chest pain or breathlessness
- Episodes lasting more than 15-20 minutes
- Fainting or near-fainting during episodes
- Rapid heartbeat with dizziness or confusion
- Frequent recurring episodes
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