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Learn about your fainting after standing up, including causes and common questions. Or get a personalized analysis of your fainting after standing up from our A.I. health assistant. At Buoy, we build tools that help you know what’s wrong right now and how to get the right care.

Fainting After Standing Up Checker

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Your Fainting After Standing Up May Also be Known as:
Fainting when sitting up
Fainting when standing up from sitting
Passing out after sitting up
Passing out after standing from sitting

Top 10 Fainting After Standing Up Causes

  1. 1.Orthostatic Syncope (Fainting)

    Orthostatic syncope refers to a type of loss of consciousness caused by rapidly standing up from a sitting position, and not enough blood reaches the head. This can cause a person to pass out, but then come back to consciousness without lasting effects.

    Losing consciousness can be scary, but your case seems to be benign without any long lasting effects. However, it might be good to consult a doctor over the telephone to discuss whether a visit is needed.

    Rarity:
    Uncommon
    Top Symptoms:
    lightheadedness, brief fainting episode, dizziness and lightheadedness before passing out, fainting after standing up, having fainted multiple times
    Symptoms that always occur with orthostatic syncope (fainting):
    brief fainting episode, fainting after standing up
    Urgency:
    Phone call or in-person visit
  2. 2.Atrial Flutter

    Atrial fibrillation or flutter is a common type of abnormal heartbeat. The heart rhythm is fast and irregular in this condition.

    You should visit your primary care physician within the next 24 hours. Your doctor will examine your heartbeat with an ECG (electrocardiogram) to confirm the diagnosis. Prescription medication is available to return the heart rhythm back to normal.

    Rarity:
    Common
    Top Symptoms:
    shortness of breath, racing heart beat, lightheadedness, deep chest pain, behind the breast bone, shortness of breath on exertion
    Urgency:
    In-person visit
  3. 3.Long Qt Syndrome

    Long QT syndrome (LQTS) is a disorder of the heart's electrical activity. It can cause sudden, uncontrollable, dangerous arrhythmias in response to exercise or stress. Arrhythmias are problems with the rate or rhythm of the heartbeat.

    You should visit your primary care physician, who will do an ECG to measure the electrical rhythym of your heart, which may identify the diagnosis. Treatment involves stopping meds that could've caused it or a defibrillator.

    Rarity:
    Common
    Top Symptoms:
    racing heart beat, brief fainting episode, not having protected the body during the fall, feeling completely normal before fainting
    Urgency:
    Primary care doctor
  4. 4.Aortic Valve Regurgitation

    Aortic valve regurgitation is a condition that occurs when your heart's aortic valve doesn't close tightly. This allows some of the blood that was just pumped out of the lower left chamber (left ventricle) to leak back into it.

    You should visit your primary care physician within the next 24 hours if you are feeling fatigue, weakness, shortness of breath, chest pain, irregular pulse or sensations of a rapid, fluttering heartbeat. Depending on severity, you may or may not need treatment.

    Rarity:
    Common
    Top Symptoms:
    shortness of breath, racing heart beat, shortness of breath on exertion, shortness of breath when lying down, brief fainting episode
    Urgency:
    Primary care doctor
  5. 5.Mitral Valve Prolapse

    Mitral valve prolapse (MVP) occurs when the valve between the heart's left upper chamber (left atrium) and the left lower chamber (left ventricle) doesn't close properly because the flaps of the valve are "floppy." Most people who have the condition are born with it.

    You should visit your primary care physician to confirm the diagnosis. Afterwards, a referral to a specialist may be needed to explore treatment options.

    Rarity:
    Uncommon
    Top Symptoms:
    fatigue, anxiety, rib pain, shortness of breath, racing heart beat
    Urgency:
    Primary care doctor

    Fainting After Standing Up Checker

    Take a quiz to find out why you’re having fainting after standing up.

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  6. 6.Chronic Carbon Monoxide Poisoning

    Chronic carbon monoxide poisoning is the slow but persistent exposure to carbon dioxide, typically where one lives or works. This can cause chronic headache, nausea, vomiting, etc.

    You should visit your primary care physician within the next 48 hours, who can make a diagnosis based on clinical suspicion and a blood test. Treatment would be to move away from the source of the carbon monoxide!

    Rarity:
    Rare
    Top Symptoms:
    fatigue, headache, irritability, nausea, difficulty concentrating
    Urgency:
    Primary care doctor
  7. 7.Hypothyroidism

    Hypothyroidism occurs when the thyroid, a butterfly-shaped organ inside the neck, no longer produces adequate levels of hormones. Thyroid hormones are essential for many bodily functions including breathing, heart rate, and metabolism.

    You should visit your primary care physician. Hypothyroidism is a complex condition that is usually treated with hormone replacement therapy.

    Rarity:
    Rare
    Top Symptoms:
    fatigue, depressed mood, difficulty concentrating, weight gain, muscle aches
    Urgency:
    Primary care doctor
  8. 8.Narrowing of the Aortic Valve

    The aorta is the main artery that carries blood out of the heart to the rest of the body. Blood flows out of the heart and into the aorta through the aortic valve. In aortic stenosis, the aortic valve does not open fully, which decreases blood flow from the heart.

    You should seek immediate medical care at an ER, where an ultrasound can assess the heart's health.

    Rarity:
    Uncommon
    Top Symptoms:
    fatigue, shortness of breath, chest pain, shortness of breath on exertion, decreased exercise tolerance
    Urgency:
    Hospital emergency room
  9. 9.Hypertrophic Cardiomyopathy

    Hypertrophic cardiomyopathy (HCM) is a disease in which the heart muscle (myocardium) becomes abnormally thick (hypertrophied). This happens sometimes as a result of long-term elevated blood pressure, and sometimes without any particular reason. The thickened heart muscle can make it harder for the heart to pump blood.

    You should visit your primary care physician. Cardiomyopathy is usually treated with prescription medication to slow down the heart rate and make the heart squeeze less forcefully. In severe cases of cardiomyopathy, an operation called myectomy is performed to remove a segment of thickened muscle from the wall dividing the right and left ventricle (the septum).

    Rarity:
    Rare
    Top Symptoms:
    fatigue, shortness of breath, dizziness, racing heart beat, shortness of breath on exertion
    Urgency:
    Primary care doctor
  10. 10.Acute Carbon Monoxide Poisoning

    Carbon monoxide (CO) is a gas that has no odor or color. But it is very dangerous. It can cause sudden illness and death. CO is found in combustion fumes, such as those made by cars and trucks, lanterns, stoves, gas ranges and heating systems. CO from these fumes can build up in places that don't have a good flow of fresh air. One can be poisoned by breathing them in.

    Call 911 immediately. Carbon monoxide poisoning is diagnosed using a blood test but treatment can begin with high clinical suspicion. Treatment involves high-flow oxygen therapy and close monitoring.

    Rarity:
    Rare
    Top Symptoms:
    fatigue, nausea, headache, shortness of breath, vomiting
    Symptoms that never occur with acute carbon monoxide poisoning:
    fever
    Urgency:
    Emergency medical service

Questions Your Doctor May Ask About Fainting After Standing Up

  • Q.If this interview is about someone else, or "myself" is selected by accident, it is very important for us not to miss this question: has the person regained consciousness?
  • Q.Do you notice your heart beating hard, rapidly, or irregularly (also called palpitations)?
  • Q.How long were you unconscious?
  • Q.Have you been feeling more tired than usual, lethargic or fatigued despite sleeping a normal amount?

If you've answered yes to one or more of these questions, check our fainting after standing up symptom checker.

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Fainting After Standing Up Symptom Checker Statistics

  • People who have experienced fainting after standing up have also experienced:

    • 5% Dizziness
    • 5% Fatigue
    • 4% Shortness of Breath
  • People who have experienced fainting after standing up were most often matched with:

    • 15% Orthostatic Syncope (Fainting)
    • 12% Atrial Flutter
    • 8% Long Qt Syndrome
  • Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

Fainting After Standing Up Checker

Take a quiz to find out why you’re having fainting after standing up.

Take a quiz