Before you faint due to vasovagal syncope, you may experience some of the following:

  • Skin paleness
  • Lightheadedness
  • Tunnel vision — your field of vision is constricted so that you see only what's in front of you
  • Nausea
  • Feeling of warmth
  • A cold, clammy sweat
  • Yawning
  • Blurred vision

During a vasovagal syncope episode, bystanders may notice:

  • Jerky, abnormal movements
  • A slow, weak pulse
  • Dilated pupils

Recovery after a vasovagal episode begins soon after fainting, generally in less than a minute. However, if you stand up too soon after fainting — within 15 to 30 minutes or so — you're at risk of fainting again.

When to see a doctor

Because fainting can be a sign of a more serious condition, such as a heart or brain disorder, you may want to consult your doctor after a fainting spell, especially if you never had one before.

Feb. 19, 2013