Most dizziness is not serious and gets better on its own or is easy to treat. Go to the ER or call 911 if dizziness comes with chest pain, trouble breathing, or an irregular heartbeat. The same goes for weakness or a change in vision or speech. A head injury or fainting with a slow recovery also needs emergency care. This guide covers each warning sign, what to do right after someone faints, and what happens at the ER.
Lightheaded or Spinning? Two Kinds of Dizziness
According to MedlinePlus, “dizzy” usually describes one of two different feelings:
- Lightheadedness is a feeling that you might faint. It happens when your brain does not get enough blood.
- Vertigo is a feeling that you or the room is spinning or moving. It often comes from the inner ear.
Knowing which one you have helps the physician find the cause. Either one can be harmless, and either one can signal something serious when other symptoms come with it.
When Dizziness Needs the ER
MedlinePlus advises calling 911 or going to an emergency room if you are dizzy and have:
- A head injury
- A fever over 101°F (38.3°C), a headache, or a very stiff neck
- Seizures
- Trouble keeping fluids down
- Chest pain
- An irregular heart rate, as if your heart is skipping beats
- Shortness of breath
- Weakness, or you cannot move an arm or leg
- A change in vision or speech
- Fainting, with a loss of alertness for more than a few minutes
Weakness on one side, trouble speaking, or a sudden change in vision can be a stroke. Call 911 right away. Our guide to recognizing a stroke walks through the signs.
What to Do Right After Someone Faints
Fainting is a brief loss of consciousness caused by a drop in blood flow to the brain. MedlinePlus notes that it usually lasts less than a couple of minutes. It recommends these steps:
- Check the person’s airway and breathing. If needed, call 911 and start CPR.
- Loosen tight clothing around the neck.
- Raise their feet about 12 inches above the level of the heart.
- If they vomit, turn them on their side so they do not choke.
- Keep them lying down for at least 10 to 15 minutes, in a cool, quiet place if possible.
When Fainting Needs 911
MedlinePlus advises calling 911 if the person who fainted:
- Fell from a height, especially if injured or bleeding
- Does not become alert within a couple of minutes
- Is pregnant, is over age 50, or has diabetes
- Has chest pain, pressure, or discomfort
- Has a pounding or irregular heartbeat
- Has lost speech, has vision problems, or cannot move one or more limbs
- Has convulsions, a tongue injury, or a loss of bladder or bowel control
Even when it is not an emergency, MedlinePlus advises seeing a provider soon if you have never fainted before, if you faint often, or if new symptoms come with it.
“Symptoms of chest pain, heart failure, exertional intolerance or syncope [fainting] should prompt medical investigation.”
Lauren Weber, MD, cardiologist at Confluence Health Hospital, in What doctors want patients to know about myocarditis
Common Causes That Are Usually Not Serious
MedlinePlus lists many everyday triggers for lightheadedness and fainting:
- Standing up too quickly after sitting or lying down
- Not drinking enough fluids, especially with vomiting, diarrhea, or fever
- Standing in one place for too long
- Coughing very hard or straining during a bowel movement
- Emotional distress, fear, or severe pain
- The flu, a cold, low blood sugar, or medicines that lower blood pressure
If you get lightheaded when you stand, get up slowly and sit for a few moments first. Keep something to hold on to nearby. Our guide to the signs of dehydration covers one of the most common causes, especially in Texas heat.
When Dizziness Is a Heart or Brain Problem
MedlinePlus lists heart problems, stroke, internal bleeding, and shock among the serious causes of lightheadedness. These usually come with other symptoms, such as chest pain, a racing heart, loss of speech, or a change in vision.
An irregular heart rhythm called atrial fibrillation (AFib) is one cause worth knowing. Cardiologists list dizziness among its symptoms, and it raises the risk of stroke.
“We know that AFib increases the risk of stroke, and therefore, if AFib goes undetected for a long time, a stroke may be your first symptom.”
Paari Dominic, MBBS, MPH, associate professor of internal and cardiovascular medicine at University of Iowa Health Care, in What doctors want patients to know about atrial fibrillation
Dizziness with chest pain or a pounding heart belongs in the ER. Learn more about our heart emergency care.
What Happens at the ER for Dizziness or Fainting?
At ER of Irving, an emergency physician checks your blood pressure, heart rate, and a quick neurological exam. An EKG looks for heart rhythm problems within minutes of arrival.
Our on-site lab checks for anemia, blood sugar problems, and electrolyte imbalances. If a stroke or a head injury is a concern, a CT scan is available on site at any hour. If you need admission or a specialist, the team arranges a direct transfer with your test results already done.
We are open 24 hours a day at 8200 N MacArthur Blvd, Suite 110, Irving, TX. Walk in any time, or call (972) 893-3148. For stroke signs, chest pain, or someone who will not wake up, call 911 first.
FAQs
Should I go to the ER or urgent care for dizziness?
Mild dizziness that passes when you sit down can usually wait for your doctor. Dizziness with chest pain, trouble breathing, weakness, or a change in speech or vision belongs in the ER. Our guide on ER vs. urgent care compares both.
Is fainting once an emergency?
Not always. A single faint with a quick recovery and a clear trigger, like standing too long, is often harmless. MedlinePlus still advises seeing a provider soon after a first faint. Call 911 for any of the warning signs above.
Can dehydration make you dizzy?
Yes. MedlinePlus lists dehydration from vomiting, diarrhea, or fever as a common cause of lightheadedness. If you cannot keep fluids down, get care. IV fluids can help.
Should I drive after a dizzy spell or fainting?
No. Ask someone else to drive, or call 911 for the warning signs above. For vertigo, MedlinePlus advises avoiding driving until 1 week after your symptoms go away.
Why does the ER do an EKG for fainting?
An abnormal heart rhythm is one of the serious causes of fainting. MedlinePlus lists an electrocardiogram among the tests used to find the cause, along with blood tests.
Medically reviewed by the ER of Irving Medical Team | Updated: September 2026
