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A high pulse rate (tachycardia) can have many causes including:
- Dehydration
- Bleeding
- Congestive heart failure
- Heart attack
- Abnormal heart rhythms
- Fear
- Anger
- Pain
- Hyperthyroidism (and other hormone abnormalities)
- Exertion
- Excitement
- Medications
- Pulmonary embolism
- Fever
- Low oxygen or other probelms breathing
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