Feeling dizzy can mean several different things. You might feel lightheaded, unsteady, as if you could faint—or feel like the entire room is spinning.

That last sensation is usually what doctors mean by vertigo.

Although the words “dizziness” and “vertigo” are often used interchangeably, they are not exactly the same. Dizziness is a broad term for several sensations, while vertigo specifically refers to a false feeling of movement or spinning.

Understanding the difference can help you recognize possible causes and know when a medical evaluation may be necessary.

What Is Dizziness?

Dizziness is a general term that can describe several sensations.

Someone experiencing dizziness may feel:

• Lightheaded or faint
• Woozy
• Unsteady on their feet
• Off-balance
• As though they might fall
• Like the surroundings are moving or spinning

Because dizziness can describe different experiences, the exact sensation matters when doctors try to determine the cause.

For example, someone who becomes lightheaded after standing up quickly may be experiencing something different from someone who feels that the room is spinning when they turn their head.

What Is Vertigo?

Vertigo is a specific type of dizziness involving the sensation of movement.

You may feel as though:

• You are spinning
• The room is spinning
• You are moving when you are actually still
• The floor is tilting or shifting

Vertigo can also cause nausea, vomiting, sweating, balance problems and difficulty walking. Some people may experience ringing in the ears or hearing changes, depending on the underlying cause.

So, while vertigo is a form of dizziness, not all dizziness is vertigo.

Vertigo vs. Dizziness: The Simple Difference

The easiest way to think about it is:

Dizziness: You feel lightheaded, faint, woozy or unsteady.

Vertigo: You feel as though you or your surroundings are spinning or moving.

This distinction is useful because different symptoms can point doctors toward different potential causes.

What Causes Dizziness?

Dizziness can have many possible causes.

Common examples include:

• Dehydration
• A sudden drop in blood pressure
• Standing up too quickly
• Certain medications
• Low blood sugar
• Motion sickness
• Migraine
• Illness
• Problems affecting balance

In some cases, dizziness can also be associated with more serious conditions involving the heart, circulation or brain.

That is why repeated, severe or unexplained dizziness should not automatically be dismissed.

What Causes Vertigo?

Vertigo is often associated with problems involving the inner ear, which plays an important role in maintaining balance.

One of the most common causes is benign paroxysmal positional vertigo, or BPPV. It can cause brief spinning sensations triggered by certain head movements, such as turning over in bed or looking upward.

Other possible causes include:

• Ménière’s disease
• Labyrinthitis
• Vestibular nerve inflammation
• Head injuries
• Certain medications
• Vestibular migraine
• Problems affecting the brain

Some forms of vertigo originate in the inner ear, while others can result from conditions affecting the brain.

Why Does BPPV Make the Room Spin?

BPPV is an inner-ear disorder involving tiny calcium particles that normally help the body’s balance system.

When these particles move into one of the inner ear’s semicircular canals, they can send confusing signals to the brain about the body’s position.

As a result, certain head movements can suddenly trigger a spinning sensation.

BPPV is considered the most common type of vertigo.

How Can You Tell Which One You Have?

One useful question is:

Do you feel like you might faint, or does it feel like you are spinning?

If you feel lightheaded or as though you might pass out, you may be experiencing a type of dizziness rather than classic vertigo.

If you clearly feel that you or the room is spinning, especially when moving your head, vertigo may be involved.

However, symptoms can overlap, and only a healthcare professional can determine the underlying cause.

Can Dehydration Cause Vertigo?

Dehydration can cause dizziness, particularly lightheadedness, but it is important not to automatically assume that every spinning sensation is caused by dehydration.

Dehydration occurs when the body loses more fluid than it takes in. It can contribute to dizziness and may occur after heavy sweating, vomiting, diarrhea, fever or inadequate fluid intake.

This distinction is particularly relevant following recent reports about Lionel Richie. TMZ reported that doctors were investigating possible slight dehydration after the singer checked himself into a St. Louis hospital following his August 29 concert.

That report does not establish dehydration as the confirmed cause of his symptoms.

Can Vertigo Make You Feel Sick?

Yes.

Vertigo can cause nausea and vomiting because the brain receives conflicting information about movement and balance.

Depending on the underlying cause, someone with vertigo may also experience hearing loss, ringing in the ears, difficulty walking or problems focusing their eyes.

If vomiting becomes severe, dehydration can become an additional concern.

When Should You See a Doctor?

Occasional mild dizziness may resolve on its own. But medical advice is appropriate when dizziness or vertigo:

• Keeps coming back
• Does not go away
• Interferes with everyday activities
• Causes significant balance problems
• Develops after starting a medication
• Is accompanied by hearing loss
• Is new or unusually severe

The NHS recommends seeking medical advice when dizziness or vertigo does not go away or repeatedly returns.

When Is Dizziness or Vertigo an Emergency?

Sudden dizziness or vertigo can sometimes be a warning sign of a serious medical problem.

The CDC lists sudden dizziness, trouble walking or loss of balance among possible stroke symptoms. Other warning signs include sudden vision problems, facial drooping, weakness or numbness—particularly on one side of the body—and difficulty speaking or understanding speech.

The CDC recommends the B.E. F.A.S.T. approach:

• B — Balance: Sudden loss of balance or coordination
• E — Eyes: Sudden vision changes
• F — Face: Facial drooping
• A — Arms: Sudden weakness or numbness
• S — Speech: Difficulty speaking
• T — Time: Call emergency services immediately

If these symptoms occur suddenly, treat them as an emergency.

What Should You Do During an Episode?

If you suddenly feel dizzy or experience vertigo, sit or lie down somewhere safe.

Avoid driving, climbing ladders or operating machinery while symptoms are present. Moving slowly and avoiding sudden changes in position can also help reduce the risk of falling.

If the symptoms are severe, persistent or accompanied by other concerning symptoms, seek medical attention.

How Do Doctors Diagnose the Cause?

There is no single test that explains every case of dizziness or vertigo.

A healthcare professional may ask:

• What does the sensation feel like?
• When did it begin?
• How long does each episode last?
• Does moving your head trigger it?
• Do you have nausea or vomiting?
• Have you noticed hearing changes or ringing in your ears?
• Are you taking any medications?
• Do you have other symptoms?

Doctors may also examine hearing, balance, eye movements and the way you walk. Additional testing may be necessary when a serious neurological problem or head injury is suspected.

The Bottom Line

Dizziness and vertigo are related, but they are not the same thing.

Dizziness is a broad term that can describe lightheadedness, wooziness or feeling unsteady. Vertigo specifically describes the sensation that you or your surroundings are spinning or moving when they are not.

Both can have relatively minor causes, but they can also signal an underlying medical condition.

The most important thing is to pay attention to what the sensation feels like, how suddenly it begins and what other symptoms occur alongside it.

And if sudden dizziness or vertigo occurs with weakness, facial drooping, speech problems, vision changes or severe loss of balance, seek emergency medical help immediately.

This article is intended for general informational purposes and is not a substitute for professional medical diagnosis or treatment.