Symptoms

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

• Pale skin
• Lightheadedness
• Tunnel vision — your field of vision narrows so that you see only what's in front of you
• Nausea
• Feeling warm
• A cold, clammy sweat
• Blurred vision

During a vasovagal syncope episode, bystanders may notice:

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

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

When to see a doctor

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've never had one before.