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Home > Health Library > Fainting
Fainting is a sudden, brief loss of consciousness. When people faint, or pass out, they usually fall down. After they are lying down, most people will recover quickly.
The term doctors use for fainting is syncope (say "SING-kuh-pee").
Fainting one time is usually nothing to worry about. But it is a good idea to see your doctor, because fainting could have a serious cause.
Fainting is caused by a drop in blood flow to the brain. After you lose consciousness and fall or lie down, more blood can flow to your brain so you wake up again.
Most causes of fainting are usually not signs of a more serious illness. In these cases, you faint because of:
Fainting caused by the vasovagal reflex is often easy to predict. It happens to some people every time they have to get a shot or they see blood. Some people know they are going to faint because they have symptoms beforehand, such as feeling weak, nauseated, hot, or dizzy. After they wake up, they may feel confused, dizzy, or ill for a while.
Some causes of fainting can be serious. These include:
Sometimes the cause is unknown.
To find the cause of fainting, a doctor will do a physical exam and ask questions about the fainting episode. Sometimes fainting is the sign of a serious problem. The doctor may ask whether:
You can help your doctor by being prepared to describe what happened before you fainted, how long you were "out," and how you felt when you woke up.
Depending on what the physical exam shows, the doctor may want to do tests. These tests may include:
If you know you tend to faint at certain times (such as when you get a shot or have blood drawn), it may help to:
You may need to see a doctor if you have ongoing dizziness or fainting.
Current as of:
July 14, 2021
Author: Healthwise StaffMedical Review: William H. Blahd Jr. MD, FACEP - Emergency MedicineAdam Husney MD - Family MedicineKathleen Romito MD - Family MedicineElizabeth T. Russo MD - Internal Medicine
Current as of: July 14, 2021
Author: Healthwise Staff
Medical Review:William H. Blahd Jr. MD, FACEP - Emergency Medicine & Adam Husney MD - Family Medicine & Kathleen Romito MD - Family Medicine & Elizabeth T. Russo MD - Internal Medicine
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