Heart palpitations

Heart palpitations are skipped, fluttering or racing heartbeats that aren't usually a symptom of a serious heart problem. Discover the causes and symptoms of this condition.

Nausea and vomiting


Tachycardia, a rapid heart rate, is caused by an abnormality in your heart's electrical impulses. Tachycardia can cause serious complications, including sudden cardiac arrest.

Tests and diagnosis



Stress test

Tilt table test

Treatments and drugs

Fainting: First aid

Feeling faint? What to do

Feb. 12, 2016
  1. Syncope. Merck Manual Professional Version. Accessed Dec. 14, 2015.
  2. Stone CK, et al., eds. Immediate management of life-threatening problems causing syncope. In: Current Diagnosis & Treatment: Emergency Medicine. 7th ed. New York, N.Y.: The McGraw-Hill Companies; 2011. Accessed Dec. 14, 2015.
  3. Jardine DL. Vasovagal syncope: New physiologic insights. Cardiology Clinics. 2013;31:75.
  4. Aminoff MJ, et al. Seizures & syncope. In: Clinical Neurology. 8th ed. New York, N.Y.: The McGraw-Hill Companies; 2012. Accessed Dec. 14, 2015.
  5. Angaran P, et al. Syncope. Neurology Clinics. 2011;29:903.
  6. Olshansky B. Upright tilt table testing in the evaluation of syncope. Accessed Dec. 15, 2015.