Vasovagal syncope - Symptoms and causes - Mayo Clinic
网页2023年3月2日 · Vasovagal syncope (vay-zoh-VAY-gul SING-kuh-pee) occurs when you faint because your body overreacts to certain triggers, such as the sight of blood or extreme emotional distress. It may also be called neurocardiogenic syncope.
Fainting: What It Feels Like and What Causes It - WebMD
网页2024年7月10日 · 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. Fainting is a common problem, accounting...
Causes of Fainting: Reasons for Passing Out - Verywell Health
网页2024年1月18日 · 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.
Mayo Clinic Q and A: Revealing the cause of unexplained fainting
网页2019年4月2日 · 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.
Fainting - Fainting - Merck Manual Consumer Version
网页Fainting (syncope) is a sudden, brief loss of consciousness during which the person falls to the ground or slumps in a chair followed by a return to consciousness. The person is motionless and limp and may have cool legs and arms, a weak pulse, and shallow breathing. Some people feel light-headed or dizzy before they faint.
Fainting: Symptoms, Causes, and Treatment - Verywell Health
网页2023年3月8日 · Fainting, also known as syncope, is a temporary loss of consciousness that most commonly occurs as a result of a sudden drop in blood pressure, resulting in a lack of oxygen to the brain. Common causes include emotional triggers, dehydration, standing up too quickly, and medication side effects.
When should you worry about fainting? - Harvard Health
网页2023年8月8日 · Fainting can be alarming, and it should be. While often the cause of fainting is something minor, fainting also can be a sign of a serious underlying medical concern. The problem is that you can't evaluate yourself, and you should let a physician determine if fainting is worrisome or not.
Fainting: Causes, Symptoms and When to see a Doctor - Patient
网页2024年7月31日 · Fainting is a temporary loss of consciousness that happens when the brain does not receive enough oxygen because of reduced blood flow to the brain. It comes on suddenly, only lasts for a short time and you recover fully within a short time. It is also often called a blackout. The medical term is syncope.
Syncope: Symptoms, Causes & Treatments - Cleveland Clinic
网页Syncope (pronounced “sin-ko-pea”) is the medical term for fainting or passing out. It happens when you have a sudden, temporary drop in the amount of blood that flows to your brain. Most of the time, a harmless, short-term cause makes you faint.
Fainting: Causes & First Aid Tips - Cleveland Clinic
网页2023年3月14日 · Fainting, or passing out, usually happens because of a drop in blood pressure, which reduces blood flow and oxygen to your brain. Most fainting spells are nothing to worry about. But talk to a healthcare provider if you lose consciousness repeatedly or have any other symptoms.