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Lightheadedness Checker

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Your Lightheadedness May Also be Known as:
Feeling faint
Light headed
Light-headed

Lightheadedness Symptoms

Feeling "lightheaded" is a general term that means you feel close to passing out. The sensation can be upsetting, but actually serves to stop you from overexerting yourself or otherwise trying to do things that your body is not in any condition to do right then. Feeling lightheaded forces you to stop, rest, and reconsider before you push yourself too far.

You might hear this condition called dizziness, or vertigo, but that is actually a different thing and means you feel as though your surroundings are spinning.

Actual lightheadedness may also be called orthostatic hypotension, postural hypotension, disequilibrium, or pre-syncope (syncope means "fainting.")

Characteristics

  • The sensation that you cannot focus your thoughts or entirely control your movements.
  • Feeling as though you are about to pass out.
  • "Graying out," or the fading of your peripheral vision.

Who is most often affected by lightheadedness?

  • Older adults often experience lightheadedness. Almost every elderly person will have some degree of orthostatic hypotension, which means you feel lightheaded upon standing up.
  • However, symptoms of lightheadedness can happen to anyone who:

    • Becomes dehydrated, either through sweating or vomiting.
    • Has a drop in blood sugar, either from vomiting, medication, or simply not eating.
    • Has a drop in blood pressure, especially from medications meant to lower blood pressure or remove fluid from the body (diuretics.)

When is lightheadedness most likely to occur?

  • When you stand up quickly after sitting or lying down, and your body's mechanism to adjust blood pressure does not work correctly or quickly enough.
  • While sweating heavily during hot weather or exertion.
  • During or right after any illness that has caused vomiting, with resultant dehydration and low blood sugar.

*Within an hour of eating a meal, especially in an elderly person.

Is lightheadedness serious?

  • Some causes, such as dehydration or low blood sugar, are easily remedied and not serious as long as they are addressed.
  • Even moderate lightheadedness can lead to fainting and/or falling, which can cause serious injury.
  • Lightheadedness can be a serious symptom if it occurs following a head injury, recurs frequently or is accompanied by signs of stroke or heart attack.

Lightheadedness Causes Overview

Many conditions can have lightheadedness as a symptom. The most common are those involving dehydration, blood sugar, and blood pressure, as well as more serious causes such as a stroke or heart disease.

Most common cause types:

  • Simple dehydration, because your blood volume is reduced and your blood pressure drops.
  • Low blood sugar, which means there may not be enough energy available for the brain to function normally.
  • Going suddenly from very hot to very cold conditions, or vice versa, which makes it nearly impossible for the body to adjust quickly enough.
  • Fainting or vasovagal syncope (also known as neurocardiogenic syncope) which is a reaction to certain triggers that cause the heart rate and blood pressure to fall. Examples of these triggers are emotional distress, seeing blood or severe pain.

Less common cause types:

  • Orthostatic/postural hypotension, especially in older adults. This means that you feel lightheaded and dizzy when you go from sitting to standing. This can simply be the result of aging, when the autonomic nervous system does not respond as quickly when you stand up, or it can be a side effect of medication.
  • Emotional causes, such as a panic attack which leads to hyperventilation.

Less common types:

  • Heart attack or significant changes in heart rate or rhythm (arrhythmia), with its disruption of the circulation, can have lightheadedness as one of its first symptoms.
  • Stroke, which also interrupts normal circulation and especially interferes with normal brain function, often starts with lightheadedness.

Top 8 Lightheadedness Causes

  1. 1.Vasovagal Syncope

    Vasovagal syncope is one of the most common causes of fainting. Vasovagal syncope occurs when the body overreacts to certain triggers, such as the sight of blood or extreme emotional distress. The body coordinates a sudden drop of heart rate and blood pressure, causing reduced blood flow to the brain and a brief loss of consciousness.

    You do not need immediate treatment for this condition, as it is normal and not a cause for concern. However, since it has been going on for a while, you may want to discuss the fainting episodes with your doctor over the phone to discuss if any intervention is needed. You may require medical attention if during the fainting episode you fell and injured a body part.

    Rarity:
    Common
    Top Symptoms:
    lightheadedness, brief fainting episode, having fainted multiple times, fainting after standing for a long time, fainting episode after a specific trigger
    Symptoms that always occur with vasovagal syncope:
    brief fainting episode, having fainted multiple times
    Symptoms that never occur with vasovagal syncope:
    feeling completely normal before fainting
    Urgency:
    Phone call or in-person visit
  2. 2.Vasovagal Syncope

    Vasovagal syncope is one of the most common causes of fainting. Vasovagal syncope occurs when the body overreacts to certain triggers, such as the sight of blood or extreme emotional distress. The body coordinates a sudden drop of heart rate and blood pressure, causing reduced blood flow to the brain and a brief loss of consciousness.

    You do not need treatment for this condition, as it is normal and not a cause for concern. You may require medical attention if during the fainting episode you fell and injured a body part.

    Rarity:
    Common
    Top Symptoms:
    lightheadedness, brief fainting episode, feeling nauseated, warm, and lightheaded before passing out, dizziness, fainting episode after a specific trigger
    Symptoms that always occur with vasovagal syncope:
    brief fainting episode
    Symptoms that never occur with vasovagal syncope:
    feeling completely normal before fainting, having fainted multiple times
    Urgency:
    Wait and watch
  3. 3.Low Blood Pressure From Bleeding

    A cut in the wrong place or without the ability to form a clot can cause enough blood loss to lead to low blood pressure.

    You should call for an ambulance to take you to the nearest ER.

    Rarity:
    Common
    Top Symptoms:
    shortness of breath, lightheadedness, chest pain, cut that did not stop bleeding with pressure
    Symptoms that always occur with low blood pressure from bleeding:
    cut that did not stop bleeding with pressure
    Urgency:
    Emergency medical service
  4. 4.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

    Lightheadedness Checker

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  5. 5.Normal Dizziness

    Dizziness is when one feels lightheaded, faint, woozy, weak, or unsteady.

    Your dizziness looks like it is a variation of normal and probably doesn't require any treatment. However, it might be safe to check in with a health care provider over the phone or in person to double check if your symptoms need any further evaluation.

    Rarity:
    Uncommon
    Top Symptoms:
    dizziness, lightheadedness
    Symptoms that always occur with normal dizziness:
    dizziness
    Symptoms that never occur with normal dizziness:
    vertigo (extreme dizziness), racing heart beat
    Urgency:
    Phone call or in-person visit
  6. 6.Hyperventiliation Syndrome

    In hyperventilation syndrome, one can experience shortness of breath and often a person breaths fast and heavily. There is usually no physical problem causing these symptoms, and symptoms are often caused by anxiety, stress or emotions. Next to shortness of breath, one can experience symptoms of chest pain, palpitations or tingling in hands, feet and face. These symptoms occur commonly as attacks.

    You should go see your primary care doctor, who can diagnose you by interview and physical exam during an attack of hyperventilation. Most people get better with treatment. Treatment of an acute attack often includes reassuring and breathing instructions and sometimes taking a tranquilizer. Treatment to avoid recurrent episodes may include behavioural therapy, physiotherapy with breathing exercises and medication.

    Rarity:
    Common
    Top Symptoms:
    anxiety, dizziness, shortness of breath, racing heart beat, chest pain
    Symptoms that always occur with hyperventiliation syndrome:
    rapid, deep breaths
    Symptoms that never occur with hyperventiliation syndrome:
    shortness of breath after a few stairs
    Urgency:
    Primary care doctor
  7. 7.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
  8. 8.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

Lightheadedness Treatments and Relief

Seek immediate treatment in the emergency room or call 911 if you experience lightheadedness along with:

Schedule an appointment for:

  • Episodes of lightheadedness that begin soon after you start a new medication.
  • Episodes of lightheadedness that recur and seem to have no specific cause.

Remedies that you can try at home:

  • First, lie down with your feet up.
  • Then try a glass of water for rehydration, or a glass of orange juice to raise blood sugar if it is low. Symptoms should clear within 15 minutes. If they do not, you should seek medical attention right away.
  • Always go slowly from sitting to standing.
  • Wear support stockings.
  • Drink plenty of fluids, but avoid alcohol – it is dehydrating.
  • Use small doses of caffeine throughout the day, as it tends to keep blood pressure from dropping.
  • Keep cool! Hot baths and otherwise high temperatures cause blood vessels to dilate and blood pressure to drop, inducing lightheadedness.

FAQs About Lightheadedness

Here are some frequently asked questions about lightheadedness.

Will dehydration cause lightheadedness?

Yes, moderate to severe dehydration can cause lightheadedness. If you do not have sufficient blood volume, which can be caused by not drinking enough to replace liquid lost to sweat and urine, it can be challenging for your body to pump blood with adequate pressure up to your brain. This lack of sufficient blood flow, especially when standing, can cause lightheadedness.

Why do I feel lightheaded when I stand up?

You can feel lightheaded when you stand up if you have not had adequate hydration, are bleeding, or have been lying down for a long time and suddenly stand up. Your body has to increase blood pressure by pumping harder and constricting blood vessels to provide adequate blood flow to the brain.

Why does anxiety cause lightheadedness?

Anxiety can cause lightheadedness through a variety of mechanisms, most notably though severe hyperventilation which lowers the carbon dioxide (CO2) in the blood, which can cause tingling in the fingertips and mild lightheadedness. Additionally, a fear response can cause a vasovagal reaction which can lead to lightheadedness and even fainting by both slowing the heart rate and vasodilation.

Can lightheadedness be a sign of low blood pressure?

Yes, lightheadedness is often a sign of low blood pressure (hypotension). The low blood pressure causing lightheadedness can be caused by a variety of illnesses or medications. Shock, surprise, or anxiety can cause a sudden dilation of blood vessels in the body lowering blood pressure, which can cause fainting.

What are the differences between dizziness and lightheadedness?

Dizziness is a condition in which one's equilibrium is upset. This can occur when an individual is unable to catch their balance, as is often the case when someone consumes excessive amounts of alcohol or feel the room may be spinning around them. If it is an inner ear canal problem, this may lead to a diagnosis of vertigo. Lightheadedness is more so a feeling of confusion or inability to focus on a particular item and often described as near-fainting. Vision may change, one may feel weak in the knees, and, generally, the room will not be spinning. Many people use the terms dizziness and lightheadiness interchangeably and why it is important to be more descriptive when discussing with your healthcare provider.

Questions Your Doctor May Ask About Lightheadedness

  • Q.Any fever today or during the last week?
  • Q.Have you been feeling more tired than usual, lethargic or fatigued despite sleeping a normal amount?
  • Q.Have you experienced any nausea?
  • Q.Do you notice your heart beating hard, rapidly, or irregularly (also called palpitations)?

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

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Lightheadedness Symptom Checker Statistics

  • People who have experienced lightheadedness have also experienced:

    • 8% Nausea
    • 7% Fatigue
    • 4% Headache
  • People who have experienced lightheadedness had symptoms persist for:

    • 41% Less Than a Day
    • 25% Less Than a Week
    • 17% Over a Month
  • Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

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    Lightheadedness Checker

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