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

Your Fainting May Also be Known as:
Asleep
Blacked out
Blacking out
Blackouts
Change in alertness
Child gave no response to voice
Child not responding to voice
Coma
Fainted

Top 8 Fainting Causes

  1. 1.Concussion (Mild Traumatic Brain Injury) Needing Imaging

    Mild traumatic brain injury requiring imaging is defined as being fairly responsive after an injury to the head but with enough warning signs that a picture of the inside of the skull needs to be taken.

    You should go to the emergency room as soon as possible (within the next hour). The risk factors and symptoms around your injury make it possible that something serious is developing within your skull, and thus, a picture needs to be taken.

    Rarity:
    Common
    Top Symptoms:
    nausea or vomiting, dizziness, sensitivity to light, difficulty concentrating, frequent mood swings
    Symptoms that always occur with concussion (mild traumatic brain injury) needing imaging:
    head or face injury
    Urgency:
    Hospital emergency room
  2. 2.Atrial Fibrillation

    An arrhythmia is a problem with the speed or rhythm of the heartbeat. The atria comprise two out of the four chambers of the heart. When their beat is disturbed, symptoms such as a racing heart, chest pain, breathlessness, and dizziness may occur.

    Call 911 immediately for an ambulance. The symptoms of atrial fibrillation can be hard to distinguish from a heart attack, so better be safe.

    Rarity:
    Common
    Top Symptoms:
    fatigue, shortness of breath, chest pain, racing heart beat, shortness of breath on exertion
    Urgency:
    Emergency medical service
  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.

    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
  4. 4.Pulmonary Embolism

    A pulmonary embolism is a sudden blockage in an artery in the lungs. It is a serious condition that can cause permanent damage to the affected lung, low oxygen levels in your blood, or damage to other organs in your body from not getting enough oxygen.

    Call 911 immediately. This is a medical emergency that requires immediate diagnosis and treatment.

    Rarity:
    Uncommon
    Top Symptoms:
    shortness of breath, cough, fever, being severely ill, wheezing
    Urgency:
    Emergency medical service

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  5. 5.Intracerebral Hemorrhage

    Intracerebral hemorrhage occurs when a diseased blood vessel within the brain bursts, allowing blood to leak inside the brain. (The name means within the cerebrum or brain).

    Call 911 immediately for an ambulance now. This is a life-threatening medical condition which needs to be treated in an intensive care unit (ICU). Blood pressure medication will be administered, as well as medications to prevent seizures and blood clots. Emergency surgery may be performed to decrease the size of the bleed and prevent pressure from building up in the brain and destroying tissue.

    Rarity:
    Rare
    Top Symptoms:
    nausea, new headache, severe headache, vomiting, stiff neck
    Urgency:
    Emergency medical service
  6. 6.Atrial Fibrillation

    An arrhythmia is a problem with the speed or rhythm of the heartbeat. The atria comprise two out of the four chambers of the heart. When their beat is disturbed, symptoms such as a racing heart, chest pain, breathlessness, and dizziness may occur.

    Call 911 immediately for an ambulance. The symptoms of atrial fibrillation can be hard to distinguish from a heart attack, so better be safe.

    Rarity:
    Rare
    Top Symptoms:
    fatigue, shortness of breath, chest pain, racing heart beat, lightheadedness
    Urgency:
    Emergency medical service
  7. 7.Subarachnoid Hemorrhage

    Subarachnoid hemorrhage is bleeding in the area between the brain and the thin tissues that cover the brain. It's typically caused by a ruptured aneurysm (out-pouching of an artery's wall).

    Call 911 immediately. This condition is a medical emergency requiring immediate attention.

    Rarity:
    Rare
    Top Symptoms:
    being severely ill, new headache, nausea or vomiting, severe headache, vision changes
    Symptoms that always occur with subarachnoid hemorrhage:
    new headache, being severely ill
    Urgency:
    Emergency medical service
  8. 8.Abdominal Aortic Aneurism (Aaa) Rupture

    The aorta is the major blood highway. Injuries to the aorta can cause life-threatening internal bleeding.

    Call 911 immediately for an ambulance. An aortic injury is a life-threatening event.

    Rarity:
    Rare
    Top Symptoms:
    being severely ill, nausea, severe abdominal pain, side pain, spontaneous back pain
    Symptoms that always occur with abdominal aortic aneurism (aaa) rupture:
    being severely ill
    Urgency:
    Emergency medical service

Questions Your Doctor May Ask About Fainting

  • Q.Have you been feeling more tired than usual, lethargic or fatigued despite sleeping a normal amount?
  • 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.Have you experienced any nausea?
  • Q.Any fever today or during the last week?

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

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Fainting Symptom Checker Statistics

  • People who have experienced fainting have also experienced:

    • 7% Dizziness
    • 6% Fatigue
    • 4% Headache
  • People who have experienced fainting were most often matched with:

    • 1% Concussion (Mild Traumatic Brain Injury) Needing Imaging
    • 1% Atrial Fibrillation

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Check my fainting symptoms

Take a quiz to find out why you’re having fainting symptoms

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