Skip to main contentSkip to accessibility services

Dizziness & Fainting

Fainting, also called syncope, is a sudden, brief loss of consciousness. It can be caused by something minor like a drop in blood pressure, or it can be a more serious issue like an abnormal heart rhythm.
Dizziness is a common symptom that may occur if you don’t eat or drink enough, take certain medications, or have an inner ear problem. It’s rarely a sign of something life-threatening, but there are serious heart and neurological problems that cause it.
Understand your lightheadedness symptoms, including 8 causes & common questions.
Long QT syndrome is an electric heart rhythm disorder that can cause fast, chaotic heartbeats. Severe symptoms are sudden fainting and seizures.
Reasons for your eyes rolling back while passing out may include orthostatic syncope, vasovagal syncope, or generalized tonic-clonic seizures. Read below for more information on causes of passing out and relief options.