Read below about fainting after exertion, including causes and common questions. Or get a personalized analysis of your fainting after exertion 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.

This symptom can also be referred to as:
Fainting while walking or running

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A.I. Health Assistant Causes for Fainting After Exertion

The list below shows results from the use of our A.I. Health Assistant by Buoy users who experienced fainting after exertion. This list does not constitute medical advice.

  1. 1.Dehydration

    Dehydration occurs when the body does not have fluid to function properly, because of decreased intake or increased losses like vomiting and diarrhea. Symptoms of dehydration include extreme thirst, dark urine, fatigue, and dizziness.

    With rehydration, symptoms resolve completely.

    Rarity:
    Rare
    Top Symptoms:
    fatigue, dizziness, vomiting or diarrhea, racing heart beat, being severely ill
    Urgency:
    Hospital emergency room
  2. 2.Right Heart Failure (Cor Pulmonale)

    Cor pulmonale is known as right heart failure and is often a long-term consequence of high blood pressure or COPD.

    Treatment depends on severity of illness.

    Rarity:
    Common
    Top Symptoms:
    fatigue, chest pain, shortness of breath on exertion, wheezing, decreased exercise tolerance
    Symptoms that never occur with right heart failure (cor pulmonale):
    severe chest pain
    Urgency:
    Hospital emergency room
  3. 3.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.

    Indefinite

    Rarity:
    Uncommon
    Top Symptoms:
    fatigue, shortness of breath, chest pain, shortness of breath on exertion, decreased exercise tolerance
    Urgency:
    Hospital emergency room
  4. 4.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.

    Hypertrophic cardiomyopathy is a life-long condition, as the heart walls are permanently enlarged.

    Rarity:
    Rare
    Top Symptoms:
    fatigue, shortness of breath, dizziness, racing heart beat, shortness of breath on exertion
    Urgency:
    Primary care doctor

    Fainting After Exertion Checker

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

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  5. 5.Eisenmenger Syndrome (Tardive Cyanosis)

    Eisenmenger syndrome is a complication due to a heart defect. The defect causes increased blood flow to the lungs instead of the body.

    This condition is considered irreversible, but heart transplantation is an option for some patients.

    Rarity:
    Ultra rare
    Top Symptoms:
    shortness of breath, racing heart beat, shortness of breath on exertion, shortness of breath when lying down, decreased exercise tolerance
    Urgency:
    Primary care doctor
  6. 6.Ebstein Anomaly of the Tricuspid Valve

    Many heart conditions are present from birth (congenital), and some can cause the valves to function improperly, resulting in symptoms such as poor blood circulation, fatigue, and difficulty breathing.

    Prognosis depends heavily on severity of the heart condition

    Rarity:
    Ultra rare
    Top Symptoms:
    shortness of breath, racing heart beat, severe fatigue, lightheadedness, deep chest pain, behind the breast bone
    Urgency:
    Primary care doctor
  7. 7.Carotid Sinus Syncope

    Carotid Sinus Syncope is a pattern of fainting caused by abnormal response to touching the neck arteries (like tying a tie).

    33% have recurrence

    Rarity:
    Common
    Top Symptoms:
    brief fainting episode, dizziness and lightheadedness before passing out, feeling nauseated, warm, and lightheaded before passing out, fainting after turning head to one side
    Symptoms that always occur with carotid sinus syncope:
    brief fainting episode
    Urgency:
    Hospital emergency room
  8. 8.Diabetic Hypoglycemia

    Hypoglycemia (severely low blood sugar) can occur in Type 1 (more common) and Type 2 Diabetes. It is usually caused by poorly timed use of blood-sugar-controlling medication.

    Indefinite

    Rarity:
    Uncommon
    Top Symptoms:
    fatigue, irritability, anxiety, dizziness, racing heart beat
    Symptoms that always occur with diabetic hypoglycemia:
    being severely ill
    Urgency:
    Hospital emergency room

Questions Your Doctor May Ask About Fainting After Exertion

  • Q.How long were you unconscious?
  • Q.Did you injure your ear?
  • Q.Have you ever been diagnosed with diabetes?
  • Q.Have you noticed any vision changes?

If you've answered yes to one or more of these questions, try our fainting after exertion symptom checker to find out more.

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Fainting After Exertion Symptom Checker Statistics

  • People who have experienced fainting after exertion have also experienced:

    • 8% Dizziness
    • 5% Hip Weakness
    • 5% Rib Pain on One Side
  • People who have experienced fainting after exertion were most often matched with:

    • 33% Dehydration
    • 33% Right Heart Failure (Cor Pulmonale)
    • 33% Narrowing of the Aortic Valve
  • Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

A.I. Health Assistant

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