What Is Dizziness?

Dizziness is a general term that patients may use to describe several different sensations.

These may include:

• Feeling lightheaded
• Feeling unsteady
• Feeling as though you may faint
• Loss of balance
• Weakness
• Blurred vision
• A floating sensation
• Feeling that the room is spinning
• Difficulty concentrating
• Sudden fatigue

The exact sensation, duration, triggers, and accompanying symptoms help determine whether dizziness may be related to the heart, blood pressure, nervous system, inner ear, or another condition.

What Is Fainting?

Fainting, also called syncope, is a temporary loss of consciousness caused by a short-term reduction in blood flow to the brain.

A fainting episode is usually brief, and the person often regains consciousness quickly. However, fainting can sometimes be a warning sign of a serious cardiovascular condition.

Symptoms before fainting may include:

• Lightheadedness
• Blurred or darkened vision
• Nausea
• Sweating
• Weakness
• Heart palpitations
• Chest discomfort
• Shortness of breath
• Ringing in the ears
• Feeling unusually warm or cold

Some patients may faint without any warning symptoms.

When Should You See a Cardiologist for Dizziness or Fainting?

A cardiovascular evaluation may be recommended when dizziness or fainting:

• Occurs repeatedly
• Happens during exercise
• Occurs while walking
• Appears without warning
• Is associated with heart palpitations
• Occurs with chest pain
• Is accompanied by shortness of breath
• Happens while sitting or lying down
• Results in injury
• Occurs in someone with heart disease
• Is associated with an abnormal heart rate
• Happens after standing up
• Occurs with very high or low blood pressure
• Has no clear explanation

A cardiologist can evaluate whether the symptoms may be caused by an abnormal heart rhythm, blood pressure problem, structural heart condition, or reduced circulation.

Can Heart Problems Cause Dizziness?

Yes. The heart must maintain enough blood flow to supply oxygen to the brain. If the heart beats too quickly, too slowly, or irregularly, blood flow may temporarily decrease.

Possible heart-related causes of dizziness include:

• Atrial fibrillation
• Supraventricular tachycardia
• Bradycardia
• Premature heartbeats
• Heart block
• Ventricular arrhythmias
• Heart valve disease
• Cardiomyopathy
• Heart failure
• Coronary artery disease
• Pulmonary hypertension
• Blood pressure abnormalities

Cardiac-related dizziness may occur suddenly and may be accompanied by palpitations, chest discomfort, breathlessness, or fainting.

Dizziness and Heart Palpitations

Dizziness occurring with a racing, pounding, fluttering, or irregular heartbeat may indicate an arrhythmia.

Possible causes include:

• Atrial fibrillation
• Supraventricular tachycardia
• Premature atrial or ventricular beats
• Very fast heart rate
• Very slow heart rate
• Pauses in the heartbeat
• Heart conduction disorders

An ECG may identify an arrhythmia if it is occurring during the appointment. When symptoms are intermittent, Holter monitoring or longer rhythm monitoring may be recommended.

Dizziness When Standing Up

Feeling dizzy after standing may be caused by a sudden drop in blood pressure. This is commonly called orthostatic or postural hypotension.

Possible contributing factors include:

• Dehydration
• Blood pressure medication
• Diuretics
• Blood loss
• Anemia
• Diabetes
• Autonomic nervous system disorders
• Prolonged bed rest
• Heart conditions
• Aging

Blood pressure may be measured while lying down, sitting, and standing to assess how the body responds to changes in position.

Fainting After Standing for a Long Time

Some people faint after standing for an extended period, especially in hot or crowded environments. This may be related to vasovagal syncope.

Common triggers include:

• Prolonged standing
• Emotional stress
• Fear
• Pain
• Seeing blood
• Heat
• Dehydration
• Fatigue
• Skipping meals

Although vasovagal fainting is often not caused by structural heart disease, recurrent episodes should still be evaluated to exclude more serious causes.

Fainting During Exercise

Fainting during physical activity requires careful medical evaluation.

Possible cardiovascular causes include:

• Abnormal heart rhythm
• Aortic valve stenosis
• Hypertrophic cardiomyopathy
• Congenital heart disease
• Coronary artery disease
• Pulmonary hypertension
• Reduced cardiac output
• Inherited electrical heart conditions

Exercise-related fainting may be more concerning than fainting after exercise has stopped, particularly when there is a personal or family history of heart disease.

Dizziness During Exercise

Dizziness during exercise may occur when the heart and circulation cannot meet the body’s increased demand for oxygen.

Possible causes include:

• Dehydration
• Low blood sugar
• Anemia
• Low blood pressure
• Heart rhythm abnormalities
• Heart valve disease
• Cardiomyopathy
• Excessive exercise intensity
• Medication effects

Cardiovascular testing may be considered when symptoms are repeated, severe, or accompanied by chest pain, palpitations, or breathlessness.

Dizziness While Sitting or Lying Down

Dizziness that occurs while sitting or lying down is less likely to be caused only by standing-related blood pressure changes.

Possible causes include:

• Abnormal heart rhythm
• Inner ear disorders
• Medication side effects
• Anxiety
• Low blood sugar
• Neurological conditions
• Blood pressure fluctuations

The pattern of symptoms can help determine whether cardiac or non-cardiac evaluation is needed.

Fainting Without Warning

Sudden fainting without warning may be more concerning than fainting preceded by nausea, sweating, or lightheadedness.

Possible causes include:

• Serious arrhythmia
• Heart block
• Very slow heart rate
• Ventricular tachycardia
• Structural heart disease
• Reduced blood flow from the heart

Heart rhythm monitoring and echocardiography may be recommended when fainting occurs unexpectedly.

Dizziness and Chest Pain

Dizziness occurring with chest pain or pressure may indicate reduced blood flow to the heart or an abnormal heart rhythm.

Seek urgent medical attention when symptoms are:

• Sudden
• Severe
• Triggered by physical activity
• Associated with sweating
• Accompanied by nausea
• Spreading to the arm, jaw, shoulder, or back
• Causing fainting or severe weakness

These symptoms may indicate a cardiovascular emergency.

Dizziness and Shortness of Breath

Dizziness combined with breathing difficulty may be associated with:

• Abnormal heart rhythm
• Heart failure
• Heart valve disease
• Pulmonary hypertension
• Anemia
• Low blood pressure
• Lung disease
• Anxiety

Cardiology evaluation can help assess whether the symptoms are related to heart function or circulation.

Dizziness After Eating

Some patients feel dizzy after meals because blood flow is redirected toward the digestive system. This may cause a temporary decrease in blood pressure, particularly in older adults.

Other possible causes include:

• Blood sugar changes
• Postprandial hypotension
• Dehydration
• Medication effects
• Food intolerance
• Heart rhythm changes
• Anxiety

Repeated symptoms should be discussed with a doctor.

Dizziness After a Viral Illness

Dizziness, weakness, and reduced exercise tolerance may continue after influenza, COVID-19, or another viral illness.

Possible causes include:

• Dehydration
• Deconditioning
• Blood pressure instability
• Autonomic dysfunction
• Myocarditis
• Pericarditis
• Abnormal heart rhythm
• Anemia

Persistent symptoms accompanied by chest pain, palpitations, fainting, or shortness of breath may require cardiovascular evaluation.

Dizziness in Women

Women may experience dizziness due to both cardiovascular and non-cardiovascular causes.

Possible contributing factors include:

• Anemia
• Low blood pressure
• Menstrual blood loss
• Pregnancy
• Hormonal changes
• Thyroid disorders
• Heart rhythm abnormalities
• Medication effects
• Dehydration

Persistent or unexplained dizziness should not automatically be attributed to stress or hormones without proper evaluation.

Dizziness and Fainting in Younger Adults

Dizziness and fainting in younger people are often related to dehydration, vasovagal syncope, anxiety, low blood sugar, or prolonged standing.

However, cardiovascular testing may be important when symptoms occur:

• During exercise
• Without warning
• With palpitations
• With chest pain
• With shortness of breath
• In someone with congenital heart disease
• In someone with a family history of sudden cardiac death
• After an abnormal ECG

Dizziness in Older Adults

Older adults may experience dizziness due to multiple contributing factors, including:

• Blood pressure medication
• Irregular heartbeat
• Heart valve disease
• Dehydration
• Diabetes
• Anemia
• Reduced balance
• Medication interactions
• Autonomic dysfunction

A comprehensive review of symptoms, blood pressure, heart rhythm, and medications may help identify the cause.

Can Anxiety Cause Dizziness or Fainting?

Anxiety can cause dizziness, rapid breathing, chest tightness, tingling, weakness, and the sensation that fainting is about to occur.

However, anxiety symptoms may resemble heart rhythm or blood pressure problems. A cardiovascular assessment may help exclude important medical causes before symptoms are attributed solely to anxiety.

How Dizziness and Fainting Are Evaluated

Dr. Lim Do-Sun may ask:

• When the symptoms began
• How often they occur
• How long each episode lasts
• Whether the room feels like it is spinning
• Whether consciousness was completely lost
• What the patient was doing before the episode
• Whether symptoms occur during exercise
• Whether symptoms occur after standing
• Whether palpitations are present
• Whether chest pain or breathlessness occurs
• Whether there was an injury
• Which medications are being taken
• Whether there is a history of heart disease
• Whether there is a family history of sudden cardiac death

A witness’s description of the fainting episode may also provide useful information.

Cardiovascular Tests for Dizziness and Fainting

Electrocardiogram

An ECG records the electrical activity of the heart. It may detect:

• Abnormal heart rhythm
• Slow heart rate
• Fast heart rate
• Heart block
• Conduction abnormalities
• Evidence of previous heart damage

Holter Monitoring

A Holter monitor continuously records heart rhythm, commonly for 24 hours or longer. It may help identify intermittent arrhythmias that are not present during a standard ECG.

Longer Heart Rhythm Monitoring

When symptoms occur less frequently, longer monitoring may be recommended to increase the chance of recording the heart rhythm during an episode.

Echocardiogram

An echocardiogram uses ultrasound to assess:

• Heart pumping function
• Heart valve function
• Heart chamber size
• Heart muscle thickness
• Blood flow
• Structural abnormalities

Blood Pressure Assessment

Blood pressure may be measured in different positions to evaluate for sudden drops when standing.

Exercise Stress Test

An exercise stress test may be considered when dizziness, fainting, chest discomfort, or palpitations occur during physical activity.

Blood Tests

Blood testing may help assess:

• Anemia
• Blood sugar
• Electrolyte levels
• Thyroid function
• Kidney function
• Dehydration
• Inflammation
• Other possible causes

Can Smartwatch ECG Data Help?

Smartwatches and portable ECG devices may record heart rhythm during an episode of dizziness or palpitations.

This information may help identify:

• A fast heart rate
• An irregular rhythm
• Possible atrial fibrillation
• Sudden heart rate changes

However, smartwatch data does not replace a medical ECG or cardiologist evaluation.

Who Should Consider Cardiology Testing?

A cardiovascular assessment may be appropriate for patients with:

• Recurrent dizziness
• Unexplained fainting
• Near-fainting episodes
• Dizziness with palpitations
• Dizziness with chest pain
• Fainting during exercise
• Shortness of breath
• Abnormal heart rate
• High or low blood pressure
• Known heart disease
• Previous abnormal ECG results
• A family history of sudden cardiac death
• Unexplained falls

Dizziness and Fainting Evaluation for International Patients

Dr. Lim Do-Sun Cardiovascular Clinic provides cardiology assessment for expatriates, tourists, international residents, students, and overseas patients in Seoul.

Patients may bring:

• Previous ECG results
• Holter monitoring reports
• Echocardiogram results
• Emergency room records
• Blood test results
• Medication lists
• Smartwatch ECG recordings
• Blood pressure logs
• Previous neurology or cardiology reports

Reviewing previous medical information can help the cardiologist understand the pattern of symptoms and avoid unnecessary repeated testing.

Why Choose Dr. Lim Do-Sun Cardiovascular Clinic?

The clinic provides:

• Cardiologist-led dizziness and fainting evaluation
• ECG testing
• Heart rhythm monitoring
• Echocardiography
• Blood pressure assessment
• Exercise-related symptom evaluation
• Cardiovascular risk assessment
• Review of overseas medical records
• Personalized testing plans
• Follow-up care
• Support for international patients in Seoul

The goal is to identify whether dizziness or fainting may be caused by the heart, blood pressure, or circulation and determine the most appropriate next step.

When Is Dizziness or Fainting an Emergency?

Seek emergency medical care immediately when dizziness or fainting:

• Occurs during exercise
• Is accompanied by severe chest pain
• Occurs with severe shortness of breath
• Happens without warning
• Is followed by confusion
• Causes difficulty speaking
• Is associated with facial weakness or limb weakness
• Occurs with a severe headache
• Causes a serious injury
• Is associated with a very fast or slow heartbeat
• Occurs repeatedly within a short period
• Happens in a patient with known heart disease

A routine clinic appointment should not delay emergency evaluation.

Book a Dizziness or Fainting Consultation in Seoul

Dizziness and fainting can result from temporary dehydration or blood pressure changes, but they may also indicate an abnormal heart rhythm or structural cardiovascular condition.

Dr. Lim Do-Sun Cardiovascular Clinic offers personalized evaluation for Korean and international patients experiencing recurrent dizziness, lightheadedness, near-fainting, unexplained loss of consciousness, palpitations, or exercise-related symptoms in Seoul.

Frequently Asked Questions

Can heart problems cause dizziness?

Yes. Arrhythmias, low blood pressure, heart valve disease, cardiomyopathy, and reduced cardiac output may cause dizziness or lightheadedness.

What is the difference between dizziness and fainting?

Dizziness may include lightheadedness, imbalance, or a spinning sensation. Fainting is a temporary loss of consciousness caused by reduced blood flow to the brain.

Why do I feel dizzy when I stand up?

A sudden drop in blood pressure when standing may cause dizziness. Dehydration, medication, anemia, diabetes, and autonomic disorders may contribute.

Can an irregular heartbeat cause fainting?

Yes. A heart rhythm that is too fast, too slow, or irregular may temporarily reduce blood flow to the brain and cause fainting.

Is fainting during exercise serious?

Fainting during exercise requires prompt medical evaluation because it may be associated with an abnormal heart rhythm or structural heart condition.

What heart tests are used for fainting?

Common tests include an ECG, Holter monitor, longer heart rhythm monitoring, echocardiogram, blood pressure assessment, blood tests, and an exercise stress test when appropriate.

Can anxiety cause dizziness?

Yes. Anxiety can cause dizziness and near-fainting sensations. However, persistent or unexplained symptoms should be medically evaluated.

Should I see a cardiologist after fainting once?

Medical assessment is recommended when fainting occurs without a clear trigger, during exercise, with palpitations or chest pain, or in someone with known heart disease.

When should I go to the emergency room?

Seek emergency care for fainting with chest pain, severe breathlessness, neurological symptoms, serious injury, confusion, or a very abnormal heart rate.