Get your Health question answered in 3 easy steps
A Doctor will be with you shortly
Ask a Doctor Now
134 Doctors are Online

What makes someone faint at the sight of someone elses blood ?

what makes someone faint at the sight of someone elses blood ? Could this be a sign of heart trouble ?
Asked On : Thu, 10 Dec 2009
Answers:  3 Views:  265
Report Abuse
Share on Facebook
Share on Twitter
Share on Google+
Question is related to
Diseases and Conditions
Medical Topics
  User's Response
it's 'vasovagal' shock resulting in inability of your 'baro-receptors' to maintain the desired B.P.
Answered: Tue, 28 Jun 2011
Rheumatologist Dr. Raheesh Ravindran's  Response
Dear Madam,Vasovagal syncope is the most common cause of fainting. Vasovagal syncope occurs when your body overreacts to triggers, such as the sight of blood or extreme emotional distress. The trigger results in vasovagal syncope — a brief loss of consciousness caused by a sudden drop in your heart rate and blood pressure, which reduces blood flow to your brain.Vasovagal syncope is usually harmless and requires no treatment.
Vasovagal syncope occurs when the part of your nervous system that regulates heart rate and blood pressure malfunctions in response to a trigger, such as the sight of blood. Your heart rate slows, and the blood vessels in your legs widen. This allows blood to pool in your legs, which lowers your blood pressure. This drop in blood pressure and slowed heart rate quickly diminish blood flow to your brain, and you faint.
The cardiac system may not be at fault.
Answered: Tue, 28 Jun 2011
I find this answer helpful
  User's Response
It's called a 'vagal response'! It happens with stress, and pain too! There's a big nerve in your body, and when it's stimulated (by fore mentioned things) it puts the break on your nervous system (to keep you from getting too rilled up) but it goes into overdrive and tells your heart to slow down and your blood pressure to go down. Usually people will pass out, and once they're recumbent, they're OK. Nothing wrong with the heart, just an active vagus nerve. (usually!!!)
Answered: Thu, 10 Dec 2009
Disclaimer: These answers are for your information only and not intended to replace your relationship with your treating physician.
This is a short, free answer. For a more detailed, immediate answer, try our premium service [Sample answer]


Loading Online Doctors....
© Ebix, Inc. All Rights Reserved.
All the information, content and live chat provided on the site is intended to be for informational purposes only, and not a substitute for professional or medical advice. You should always speak with your doctor before you follow anything that you read on this website. Any health question asked on this site will be visible to the people who browse this site. Hence, the user assumes the responsibility not to divulge any personally identifiable information in the question. Use of this site is subject to our Terms & Conditions
Already Rated.
Your rating:

Ask a Doctor