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www.webmd.com/brain/understanding-fainting-basics

Fainting, also called syncope (pronounced SIN-ko-pee), is a sudden, brief loss of consciousness and posture caused by decreased blood flow to the brain. Many different conditions can cause ...

www.verywellhealth.com/causes-of-fainting-1298399

It is possible to die from alcohol poisoning, and passing out is a sign of serious intoxication. Other drugs—legal as well as illegal—can knock you out for a variety of reasons, and some are serious causes of dehydration or drops in blood pressure.

www.healthline.com/health/fainting

If you have no prior history of fainting and have fainted multiple times, your doctor will want to determine if an underlying medical condition is the cause. Even people who only pass out once ...

www.medicalnewstoday.com/articles/182524.php

Fainting, or syncope, refers to a sudden and temporary loss of consciousness, usually because of a lack of oxygen in the brain. Oxygen deprivation to the brain has many possible causes, including ...

www.medicinenet.com/fainting/article.htm

Fainting (syncope, passing out) can be caused by a variety of situations, for example, pregnancy, medications, diabetes, anemia, heart conditions, age, and electrolyte imbalances. The person who has fainted doesn't know that they have passed out. Signs and symptoms of fainting include weak, lightheaded, sweaty, vertigo, and hearing sensations.

www.refinery29.com/en-us/passing-out-causes-of-fainting

And when it happens, it can be pretty freaky, whether you're the fainter or you see someone else pass out. "Passing out is super common, ... Passing Out Causes Of Sudden Fainting For No Reason .

health.clevelandclinic.org/exactly-fainting-spell-worry

It occurs in about one-third of the general population, and there are a number of different things that can cause someone to pass out. Most cases are benign but being attentive could save a life.

www.emedicinehealth.com/fainting/article_em.htm

Even if you believe the cause of the fainting is harmless, have the person lie down for 15-20 minutes before attempting to get up again. Ask about any persistent symptoms, such as headache, back pain, chest pain, shortness of breath, abdominal pain, weakness, or loss of function, because these may indicate a life-threatening cause of the fainting.

www.drugs.com/symptom/blacking-out-fainting-or-loss-of-consciousness-1.html

Blacking Out, Fainting, or Loss of Consciousness Getting Started. Welcome. The two main reasons for blacking out are insufficient blood flow to the brain and abnormal electrical activity within the brain (a seizure). While both of these sound scary, in reality most episodes of blacking out are not related to life threatening health problems.

www.md-health.com/Passing-Out-from-Pain.html

Passing Out from Pain: Why and What to Do Passing out because of pain is not uncommon but rather scary. It is necessary to learn about the causes of this condition and how you can deal with it.