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what causes fainting or blackouts ?

Here are some links that might be useful to you:

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

https://www.webmd.com/brain/understanding-fainting-basics
Fainting and Passing Out: What It Feels Like and What Causes It – WebMD
24 oct. 2023The Difference Between Blackout and Fainting. Some people use the terms blackout and fainting interchangeably, but they are different things. A blackout is a loss of memory.Fainting, also called …

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

https://www.verywellhealth.com/causes-of-fainting-1298399
Causes of Fainting: Reasons for Passing Out – Verywell Health
18 janv. 2024Summary. Fainting is a sudden loss of consciousness from a lack of blood flow to the brain. It can be caused by many things, including dehydration, shock, too much alcohol, and even anxiety. While a fainting spell usually doesn’t last for long, it can be associated with a life-threatening event like a heart attack.

https://www.hopkinsmedicine.org / health / conditions-and-diseases / syncope-fainting

https://www.hopkinsmedicine.org / health / conditions-and-diseases / syncope-fainting
Syncope (Fainting) | Johns Hopkins Medicine
This causes blood pressure to drop, so less blood flows to the brain and fainting (syncope) or near-fainting (pre-syncope) occurs. Reflex syncope is the most frequent cause of fainting. Vasovagal syncope — the common faint — occurs in one third of the population. It is by far the most common form of reflex syncope.

https://my.clevelandclinic.org/health/symptoms/21699-fainting

https://my.clevelandclinic.org/health/symptoms/21699-fainting
Fainting: Causes & First Aid Tips – Cleveland Clinic
The most common reason for fainting is a sudden drop in blood pressure, which reduces blood flow and oxygen to your brain. There are many reasons why a drop in blood pressure could lead to a temporary loss of consciousness: Cardiac syncope: This type of syncope involves fainting because of a heart problem. Many heart conditions can affect how …

https://www.healthgrades.com/right-care/brain-and-nerves/blackouts

https://www.healthgrades.com/right-care/brain-and-nerves/blackouts
Blackouts – Symptoms, Causes, Treatments – Healthgrades
Fainting, also known as syncope, is a term used to refer to a blackout. Conditions that can cause syncope include cardiac arrhythmias (abnormal heart rate or rhythm), abnormalities of the heart muscle or valves, or a condition called postural hypotension, in which a person faints after standing up quickly from a lying position and there is …

https://newsnetwork.mayoclinic.org/discussion/mayo-clinic-q-and-a-revealing-the-cause-of-unexplained-fainting

https://newsnetwork.mayoclinic.org/discussion/mayo-clinic-q-and-a-revealing-the-cause-of-unexplained-fainting
Mayo Clinic Q and A: Revealing the cause of unexplained fainting
ANSWER: Yes, make an appointment to see your health care provider. Fainting, or passing out — a temporary loss of consciousness also known as syncope — is caused by insufficient blood flow to the brain. Some causes of syncope are fairly benign, such as from dehydration, or during a frightening or uncomfortable event, such as a blood draw.

https://www.health.harvard.edu/decision_guide/blacking-out-fainting-or-loss-of-consciousness

https://www.health.harvard.edu/decision_guide/blacking-out-fainting-or-loss-of-consciousness
Blacking Out, Fainting, or Loss of Consciousness
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. This guide is designed to provide insight into why you passed out.

https://www.medicalnewstoday.com/articles/what-causes-blackouts

https://www.medicalnewstoday.com/articles/what-causes-blackouts
What causes blackouts? – Medical News Today
Other possible causes of blackouts include syncope, epilepsy, and stress. Alcohol blackouts . Two different kinds of blackouts can result from drinking alcohol: en bloc and fragmentary.

https://www.heart.org/en/health-topics/arrhythmia/symptoms-diagnosis–monitoring-of-arrhythmia/syncope-fainting

https://www.heart.org/en/health-topics/arrhythmia/symptoms-diagnosis–monitoring-of-arrhythmia/syncope-fainting
Syncope (Fainting) | American Heart Association
16 nov. 2022Syncope is a symptom that can have several causes, ranging from harmless to life-threatening conditions. Many non-life-threatening factors, such as strong emotions, heavy sweating, exhaustion or the pooling of blood in the legs due to sudden changes in body position, can trigger syncope.

https://www.healthline.com/health/fainting

https://www.healthline.com/health/fainting
Fainting: Causes, Types, and Prevention – Healthline
3 juil. 2023dehydration. standing in one position for too long. standing up too quickly. physical exertion in hot temperatures. coughing too hard. straining during a bowel movement. consuming drugs or alcohol …
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