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Lightheadedness Symptoms, Causes & Common Questions

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Last updated June 11, 2022

Lightheadedness quiz

Take a quiz to find out what's causing your lightheadedness.

Understand your lightheadedness symptoms, including 8 causes & common questions.

8 most common cause(s)

Vasovagal Syncope
Illustration of various health care options.
Transient Ischemic Attack
Iron Deficiency Anemia
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Illustration of various health care options.
Hyperventilation syndrome
Illustration of various health care options.
Hypertrophic cardiomyopathy
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Orthostatic syncope (fainting)

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Lightheadedness symptoms

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

You might hear this condition being 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").

Common characteristics of lightheadedness

If you're experiencing lightheadedness, it can likely be described by:

  • 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?

The following individuals are more 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.
  • The risk is generally greater for anyone who: Becomes dehydrated, either through sweating or vomiting; has a drop in blood sugar, either from vomiting, medication, or simply not eating; or 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?

Lightheadedness is more likely when:

  • You stand up quickly after sitting or lying down: Your body's mechanism to adjust blood pressure does not work correctly or quickly enough.
  • You are sweating heavily during hot weather or exertion
  • You have 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?

Lightheadedness may vary in severity depending on the cause:

  • Not serious: Some causes, such as dehydration or low blood sugar, are easily remedied and not serious as long as they are addressed.
  • Moderately serious: Even moderate lightheadedness can lead to fainting and/or falling, which can cause serious injury.
  • Serious: 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

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 causes

The most common reasons for lightheadedness include the following:

  • Simple dehydration: This causes your blood volume to be reduced and your blood pressure to drop.
  • Low blood sugar: This 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, this 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 causes

Less common causes of lightheadedness may include the following:

  • Orthostatic/postural hypotension: More likely 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.

Serious causes

The following, although less common, are very serious causes of lightheadedness:

  • Heart attack or significant changes in heart rate or rhythm (arrhythmia): These events significantly disrupt circulation and can have lightheadedness as one of the first symptoms.
  • Stroke: This also interrupts normal circulation and significantly interferes with normal brain function — often starting with lightheadedness.

Vasovagal syncope

Vasovagal syncope is one of the most common causes of fainting. 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.

Stroke or tia (transient ischemic attack)

Transient ischemic attack, or TIA, is sometimes called a "mini stroke" or a "warning stroke." Any stroke means that blood flow somewhere in the brain has been blocked by a clot.

Risk factors include smoking, obesity, and cardiovascular disease, though anyone can experience a TIA.

Symptoms are "transient," meaning they come and go within minutes because the clot dissolves or moves on its own. Stroke symptoms include weakness, numbness, and paralysis on one side of the face and/or body; slurred speech; abnormal vision; and sudden, severe headache.

A TIA does not cause permanent damage because it is over quickly. However, the patient must get treatment because a TIA is a warning that a more damaging stroke is likely to occur. Take the patient to the emergency room or call 9-1-1.

Diagnosis is made through patient history; physical examination; CT scan or MRI; and electrocardiogram.

Treatment includes anticoagulant medication to prevent further clots. Surgery to clear some of the arteries may also be recommended.

Rarity: Common

Top Symptoms: dizziness, leg numbness, arm numbness, new headache, stiff neck

Symptoms that never occur with stroke or tia (transient ischemic attack): bilateral weakness

Urgency: Emergency medical service

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, fainting for the first time

Symptoms that always occur with orthostatic syncope (fainting): brief fainting episode, fainting after standing up

Urgency: Phone call or in-person visit

Normal dizziness

Feeling dizzy is never really normal unless it's from deliberate spinning, as with amusement park rides. The cause is rarely serious, but should be investigated as ongoing dizziness interferes with quality of life.

Normal dizziness – meaning it is not caused by a serious medical condition – may be due to:

  • Medication.
  • Binge drinking or recreational drug use.
  • Dehydration.
  • Low blood sugar.
  • Panic attacks and hyperventilating.
  • Pregnancy, when the growing fetus interferes with circulation.
  • Menopause, when hormonal changes and hot flashes affect circulation.
  • Postural hypotension, when blood pressure drops upon sitting up or standing.

Symptoms include feeling lightheaded or off-balance; a sensation of spinning; and sometimes nausea and vomiting.

Any dizziness can cause a fall with serious injury and will affect activities of daily living. A medical provider can determine the cause and offer solutions.

Diagnosis is made through patient history, physical examination, simple neurological tests, and sometimes blood tests and heart monitoring.

Dizziness sometimes clears up on its own after a short time. Further treatment involves adjusting medications and making lifestyle improvements, if needed.

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

Iron deficiency anemia

Iron deficiency anemia means that the body does not have enough iron to form hemoglobin, the protein in red blood cells that carries oxygen throughout the body.

The condition is caused by:

  • Acute blood loss through injury, surgery, or childbirth.
  • Chronic blood loss through an ulcer, overuse of aspirin or nonsteroidal anti-inflammatory drugs (NSAIDs,) or heavy menstrual periods.
  • Inability to absorb dietary iron due to intestinal surgery or disease, or interference from certain medications.
  • A diet low in iron-supplying foods.

Symptoms include fatigue, shortness of breath, lack of endurance, and chest pain with rapid and irregular heartbeat.

If not treated, iron deficiency anemia can lead to heart disease because the heart has to pump extra blood to get enough oxygen to the tissues. Developmental problems in children can also occur.

Diagnosis is made through physical examination and blood tests.

Treatment includes a diet higher in iron-rich foods, such as red meat and dark green leafy vegetables, along with iron supplements. Severe cases may require hospitalization for blood transfusion and/or intravenous iron therapy.

Hyperventilation syndrome

Hyperventilation syndrome is a type of anxiety or panic attack, where the primary symptom is fast, shallow breathing that leads to a drop in carbon dioxide levels in the blood. This drops changes the body chemistry and causes the discomfort.

Any sort of fear or excitement that might provoke an anxiety attack can bring on hyperventilation syndrome.

Symptoms are worse in some patients than in others, but include anxiety; lightheadedness; pain and constriction in the chest; numbness and tingling of the extremities; and a feeling of suffocation.

It is important to seek treatment for hyperventilation syndrome, because the symptoms can be debilitating and interfere with quality of life.

Diagnosis is made through detailed patient history, as well as a complete physical examination and lab tests to rule out any other conditions.

Treatment involves showing that patient that, during an anxiety attack, simply breathing into a paper bag for a few minutes will ease the symptoms and allow recovery. Psychological counseling, with an emphasis on managing stress, is also helpful.

Rarity: Common

Top Symptoms: anxiety, shortness of breath, dizziness, racing heart beat, chest pain

Symptoms that always occur with hyperventilation syndrome: rapid, deep breaths

Symptoms that never occur with hyperventilation syndrome: shortness of breath after a few stairs

Urgency: Primary care doctor

Hypertrophic cardiomyopathy

Hypertrophic cardiomyopathy (HCM) means "abnormal thickening of the heart muscle." This can interfere with the heart's ability to pump blood.

Most often, an inherited genetic mutation causes HCM. However, aging, high blood pressure, diabetes, or thyroid disease can sometimes bring it about.

Many people have no symptoms at all. Some have unexplained chest pain, shortness of breath, fainting, or the feeling of rapid, fluttering heartbeat, because the abnormally thick heart muscle interferes with normal heartbeat and causes an arrhythmia. Take the patient to the emergency room or call 9-1-1.

Untreated hypertrophic cardiomyopathy can lead to serious heart disease and even sudden cardiac arrest and death, especially in people under age 30.

Diagnosis is made through echocardiogram; electrocardiogram; treadmill stress test; and/or cardiac MRI.

Treatment involves medication to relax the enlarged heart muscle and slow the rapid pulse. Surgery to remove some of the thickened muscle may be done, or a defibrillator may be implanted.

Anyone with a family history of HCM should ask their medical provider about screening for the disease, which involves regular echocardiography.

Rarity: Rare

Top Symptoms: fatigue, shortness of breath, dizziness, racing heart beat, shortness of breath on exertion

Urgency: Primary care doctor


Dehydration means the body does not have enough water to carry out its normal processes.

Most susceptible to serious dehydration are young children with fever, vomiting, and diarrhea. In adults, some medications increase urination and can lead to . Anyone exercising vigorously, especially in hot weather, can quickly become dehydrated.

Symptoms include extreme thirst; dry mouth; infrequent, dark-colored urine; dizziness; and confusion. Young children may have sunken eyes, cheeks, and soft spot on top of the skull.

Severe dehydration is a serious medical emergency that can lead to heat stroke, kidney damage, seizures, coma, and death. Take the patient to the emergency room or call 9-1-1.

Diagnosis is made through blood tests and urine tests.

Mild dehydration can be treated simply by drinking extra water, or water with electrolytes such as sports drinks. More serious cases may be hospitalized for intravenous fluids.

It's important for anyone who is outside in hot weather, or who is ill, to drink extra fluids even before feeling thirsty as thirst is not always a reliable guide.

Rarity: Rare

Top Symptoms: fatigue, dizziness, vomiting or diarrhea, racing heart beat, being severely ill

Urgency: Hospital emergency room

Lightheadedness treatments and relief

When lightheadedness is an emergency

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

When to see a doctor for lightheadedness

You should schedule an appointment for:

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

At-home treatments for lightheadedness

Remedies that you can try at home include the following:

  • Lie down with your feet up
  • Drink water or juice: Try a glass of water for rehydration. If you don't feel better soon, have 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 transition slowly from sitting to standing
  • Wear support stockings
  • Drink plenty of fluids, but avoid alcohol: Alcohol is dehydrating
  • Use small doses of caffeine throughout the day: 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

  • Have you been feeling more tired than usual, lethargic or fatigued despite sleeping a normal amount?
  • Did you faint?
  • Do you notice your heart beating hard, rapidly, or irregularly (also called palpitations)?
  • Have you experienced any nausea?

Self-diagnose with our free Buoy Assistant if you answer yes on any of these questions.

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The stories shared below are not written by Buoy employees. Buoy does not endorse any of the information in these stories. Whenever you have questions or concerns about a medical condition, you should always contact your doctor or a healthcare provider.
Dr. Rothschild has been a faculty member at Brigham and Women’s Hospital where he is an Associate Professor of Medicine at Harvard Medical School. He currently practices as a hospitalist at Newton Wellesley Hospital. In 1978, Dr. Rothschild received his MD at the Medical College of Wisconsin and trained in internal medicine followed by a fellowship in critical care medicine. He also received an MP...
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