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  1. www.healthline.com › health › how-much-blood-can-you-loseHow Much Blood Can You Lose Without Severe Side Effects? -...

    Feb 26, 2022 · Find out how much blood you lose in common situations, such as a nosebleed, and how much you can lose before nausea, fainting, shock, or other complications occur.

  2. www.healthline.com › health › how-much-blood-in-human-bodyHow Much Blood Is in Your Body and How Much You Can Lose -...

    Jul 18, 2017 · Your blood pressure and heart rate will stay close to normal as you lose up to 30 percent of your blood, or up to 1,500 mL of blood (0.4 gallons). After losing this amount of blood, you will...

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  4. www.webmd.com › a-to-z-guides › hypovolemic-shockHypovolemic Shock: Symptoms, Stages, Causes, Diagnosis, and ... -...

    Nov 3, 2022 · Hypovolemic shock is a life-threatening condition that happens when you lose a lot of blood or fluids. Learn how much blood you can lose before fainting, the stages of shock, and how to prevent and treat it.

  5. my.clevelandclinic.org › health › diseasesHypovolemic Shock: Causes, Symptoms and Treatment - Cleveland...

    Apr 16, 2022 · Hypovolemic shock is a serious condition caused by losing more than 20% of your blood volume or fluids. Learn about the stages, symptoms, causes and treatment of this medical emergency.

  6. www.webmd.com › brain › understanding-fainting-basicsFainting: What It Feels Like and What Causes It - WebMD

    Jul 10, 2024 · Fainting is a sudden, brief loss of consciousness and posture caused by decreased blood flow to the brain. Learn about the types, causes, symptoms and treatment of fainting, and how to prevent it.

  7. my.clevelandclinic.org › health › symptomsFainting: Causes & First Aid Tips - Cleveland Clinic

    Fainting is a temporary loss of consciousness from a sudden decrease of blood flow to your brain. Learn about the possible causes, signs and first aid tips for fainting, and when to seek medical attention.

  8. my.clevelandclinic.org › health › diseasesSyncope: Symptoms, Causes & Treatments - Cleveland Clinic

    Nov 3, 2022 · Syncope (pronounced “sin-ko-pea”) is the medical term for fainting or passing out. It happens when you have a sudden, temporary drop in the amount of blood that flows to your brain. Most of the time, a harmless, short-term cause makes you faint. Syncope can happen if you have: A sudden drop in blood pressure. A drop in your heart rate.