• Weil Nutrition Corner
  • Meet Dr. Weil
  • Origins
  • Healthy Aging
  • Marketplace
  • Podcasts
  • Accessibility
  • Subscribe
Dr. Weil Logo Dr. Weil Logo Weil™ Andrew Weil, M.D.
  • Health & Wellness
    Health & Wellness
    Body, Mind & Spirit
    • Addiction
    • Allergy & Asthma
    • Autoimmune Disorders
    • Back Pain
    • Bone & Joint
    • Cancer
    • Colds & Flu
    • Dental & Oral
    • Diabetes
    • Disease & Disorders
    • Ears, Nose, & Throat
    • Feet
    • Gastrointestinal
    • Hair, Skin, & Nails
    • Headache
    • Heart
    • Insects & Parasites
    • Liver & Kidney
    • Mental Health
    • Pregnancy & Fertility
    • Respiratory
    • Sexual Health
    • Sleep Issues
    • Stress & Anxiety
    • Vision
    Balanced Living
    • Exercise & Fitness
    • Gardening
    • Healthy Home
    • Healthy Living
    • Meditation & Inspiration
    • Meet Dr. Weil
    • Pets & Pet Care
    • Technology
    • Wellness Therapies
    Health Centers
    • Aging Gracefully
    • Children
    • Condition Care Guide
    • Men
    • Women
  • Diet & Nutrition
    Diet & Nutrition
    Anti-Inflammatory Diet & Pyramid
    Cooking & Cookware
    Diets & Weight Loss
    Food Safety
    Nutrition
    Recipes
  • Vitamins, Supplements & Herbs
    Vitamins, Supplements & Herbs
    Herbs
    Supplements & Remedies
    Vitamins
  • Ask Dr. Weil
  • Blogs
    Blogs
    Bulletins
    Health Tips
    Spontaneous Happiness
  • Mushrooms
  • Sleep
Press "Enter" to search
Dr. Weil Logo Weil™ Andrew Weil, M.D.
  • Health & Wellness
    Health & Wellness
    Body, Mind & Spirit
    • Addiction
    • Allergy & Asthma
    • Autoimmune Disorders
    • Back Pain
    • Bone & Joint
    • Cancer
    • Colds & Flu
    • Dental & Oral
    • Diabetes
    • Disease & Disorders
    • Ears, Nose, & Throat
    • Feet
    • Gastrointestinal
    • Hair, Skin, & Nails
    • Headache
    • Heart
    • Insects & Parasites
    • Liver & Kidney
    • Mental Health
    • Pregnancy & Fertility
    • Respiratory
    • Sexual Health
    • Sleep Issues
    • Stress & Anxiety
    • Vision
    Balanced Living
    • Exercise & Fitness
    • Gardening
    • Healthy Home
    • Healthy Living
    • Meditation & Inspiration
    • Meet Dr. Weil
    • Pets & Pet Care
    • Technology
    • Wellness Therapies
    Health Centers
    • Aging Gracefully
    • Children
    • Condition Care Guide
    • Men
    • Women
  • Diet & Nutrition
    Diet & Nutrition
    Anti-Inflammatory Diet & Pyramid
    Cooking & Cookware
    Diets & Weight Loss
    Food Safety
    Nutrition
    Recipes
  • Vitamins, Supplements & Herbs
    Vitamins, Supplements & Herbs
    Herbs
    Supplements & Remedies
    Vitamins
  • Ask Dr. Weil
  • Blogs
    Blogs
    Bulletins
    Health Tips
    Spontaneous Happiness
  • Mushrooms
  • Sleep
  • Weil Nutrition Corner
  • Meet Dr. Weil
  • Origins
  • Healthy Aging
  • Marketplace
  • Podcasts
  • Accessibility
  1. Home
  2. Health & Wellness
  3. Balanced Living
  4. Healthy Living

Feeling Faint During a Blood Test?

I have a tendency to faint when I have blood tests, and when I hear about medical procedures. What do these fainting episodes mean for my general health? Are there any supplements that can help?

Andrew Weil, M.D. | June 8, 2007

Business and healthy lifestyle concept. Portrait of young office woman standing in yoga pose at workplace. Smiling business lady relaxing with arms folded in Prayer gesture on her break time
1 min

This type of fainting, which may be an inherited tendency, is called vasovagal syncope and is an overreaction on the part of your involuntary nervous system to some stimulus – in this case, an impending blood test or medical procedure. Some people faint in response to the sight of blood or to an emotional upset. Other common causes of fainting include standing for a long period of time and exposure to heat or crowds or both. Some people faint in association with anxiety attacks, strenuous coughing, or even urinating. In your case, anxiety about a blood test sets off an exaggerated nervous system response – your heart rate and blood pressure drop, decreasing the flow of blood to the brain and leading to the fainting episode, which is the body’s way of protecting the brain from lack of blood. No doubt you usually recover quickly, within seconds or just a few minutes.

Although fainting can also be a symptom of some serious medical conditions (heart disease, diabetes, or a brain problem), the type of fainting you describe has no implications for your general health.

Some people experience warning symptoms before fainting, such as weakness, lightheadedness, nausea, yawning, sweating, feeling warm, or rapid breathing. If you sense that a fainting spell is coming on, lie down and put your legs up (this allows blood to keep flowing to your brain), or sit down and put your head between your knees. Lying down for blood tests may not prevent you from fainting but at least it will prevent a fall.

I know of no supplements that can help you overcome this tendency. But you may be able to avoid episodes via mind/body work such as relaxation techniques or hypnosis. Breathing techniques in particular may help you address an exaggerated response to situations that activate this part of your nervous system. The 4-7-8 Relaxing Breath that I teach will help you.

Andrew Weil, M.D.

Dr. Weil on Healthy Aging

Start Your 14-Day Free Trial

Free Newsletters

Stay Connected With Dr. Weil

Anti-Inflammatory Diet

Follow Dr. Weil’s Food Pyramid

Get Dr Weils Newsletter Updates

Exclusive Lifestyle, Nutrition & Health Advice

Dr. Weil's FREE health living advice delivered to you!

By clicking "Subscribe," you agree to the DrWeil.com Terms and Conditions and Privacy Policy. You also agree to receive emails from DrWeil.com, and you may opt out of DrWeil.com subscriptions at any time.

Trending Now

Portrait an unknown male doctor holding a stethoscope behind
Healthy Living

A Better Kind of Medicine?

Young couple is relaxing in the sauna. High angle view.
Healthy Living

A Better Way to Sweat?

Laboratory assistant analyzing a blood sample
Healthy Living

A Dark View of Your Blood?

Meet Dr. Weil: A Healthy Doctor | Andrew Weil, M.D.
Healthy Living

A Healthy Doctor

Dr. Weil Logo Weil™ Andrew Weil, M.D.
Dr. Weil's Signature

Exclusive Lifestyle, Nutrition & Health Advice

  • About Us
  • Press Information
  • Advertising
  • Contact Us
  • Terms of Use
  • Privacy Policy
  • Accessibility

Terms of Use | Privacy Policy

Information on this website is provided for informational purposes only and is not intended as a substitute for the advice provided by your physician or other healthcare professional. You should not use the information on this website for diagnosing or treating a health problem or disease, or prescribing any medication or other treatment. Any third party offering or advertising on this website does not constitute an endorsement by Andrew Weil, M.D. or Healthy Lifestyle Brands.

© Copyright 2025 Healthy Lifestyle Brands, LLC. All rights reserved. Reproduction in whole or in part without permission is prohibited. www.drweil.com