He was attended to by local medical staff on-site and will be fine. He and Faith thank everyone for their love and support and look forward to seeing their Irish fans again soon. It seems extreme, but it turns out there are a few very good reasons why being dehydrated can make you pass out. The most obvious cause of dehydration is simply not drinking enough water, and if you're pregnant, breastfeeding , or particularly active you'll need even more than usual.
But certain medications such as blood thinners that make you need to pee more frequently or having a cold or flu with a fever can also increase your risk for dehydration partly because you're sweating more and partly because you may just not feel up to putting anything in your stomach.
Having severe and acute diarrhea or vomiting can cause dehydration because you lose a lot of fluids in a short amount of time, the Mayo Clinic says.
Also, if you have uncontrolled diabetes or underlying kidney disease, you're at a higher risk for dehydration. Your blood carries oxygen and nutrients to the tissues and organs in your body, including your brain. So if you're not getting as much blood and oxygen as normal thanks to dehydration, you might pass out due to your brain's lack of oxygen, Susan Besser, M.
The way your heart works contributes as well. As your circulating blood volume drops, your heart will compensate by trying to pump that blood more quickly, Brett Etchebarne, M. Etchebarne says. In some cases you might notice a few warning signs before you actually black out, like feeling weak, confused, or dizzy or having muscle cramps, a rapid heartbeat, or very dark pee, Janyce M.
Sanford, M. POTS does not usually get worse with age. It's important to identify the cause of syncope, if possible, to rule out a dangerous heart condition. Depending on your symptoms and circumstances, the following tests may be used to find the cause:. Exercise stress test : ECG recorded while strenuously exercising. Echocardiogram or transesophageal echocardiogram : ultrasound of the heart.
Physical examination , including orthostatic vital signs and carotid sinus massage. Tilt table test : measurement of heart rate and blood pressure in response to upright tilt, which simulates prolonged standing. Holter monitor : a portable ECG you wear continuously for one to seven days to record your heart rhythms over time. Event monitor : a portable ECG you wear for one or two months, which records only when triggered by an abnormal heart rhythm or when you manually activate it.
Catheter ablation : procedure to cauterize the specific heart cells that cause abnormal heart rhythms. Pacemakers : device inserted under the skin below the collarbone to deliver regular electrical pulses through thin, highly durable wires attached to the heart; used to treat bradycardia, heart block and some types of heart failure.
Implantable cardioverter-defibrillators ICDs : a small implanted device that delivers an electrical pulse to the heart to reset a dangerously irregular heartbeat; often used to treat ventricular tachycardia or heart failure. Health Home Conditions and Diseases. What causes syncope? There are many potential causes, but the most common ones include: Serious Cardiovascular Conditions Cardiac Syncope If fainting occurs frequently and is not because of dehydration or sudden postural change, you may need to be tested for a serious heart or vascular condition.
Common causes of cardiac syncope: Arrhythmia and abnormal heart rhythm: During episodes of heart arrhythmia, the heart works inefficiently and not enough oxygenated blood can circulate to the brain. Reflex Syncope Neurally Mediated Syncope, Vasovagal Syncope, Vasodepressor Syncope, the Common Faint Reflex syncope is the result of a reflex response to some trigger, in which the heart slows or blood vessels dilate widen.
Some Vasovagal Syncope Triggers Seeing blood not considered a serious symptom Getting an injection or having blood drawn not considered serious Standing up quickly a "head rush" is considered pre-syncope Standing upright for a long time Sudden and unexpected trauma, stress or pain, such as being hit Blood donation Other types of reflex syncope include: Situational syncope , a sudden reflex response to a trigger other than those listed above.
Triggers include: Coughing, sneezing, laughing, swallowing Pressure on the chest after exertion or exercise Defecating Urinating post-micturition syncope : occurs in men while standing to urinate Eating a meal Sudden abdominal pain Blowing a brass instrument or lifting weights Carotid Sinus Syncope, a response in older adults that occurs when pressure is applied to the carotid artery in the neck. Orthostatic Hypotension Orthostatic upright hypotension low blood pressure when standing can also cause fainting because blood has trouble going against gravity to reach the brain.
Postural Orthostatic Tachycardia Syndrome POTS Postural orthostatic tachycardia syndrome increased heart rate when standing , or POTS, is a rare clinical syndrome characterized by an increase in heart rate of at least 30 beats per minute on standing and orthostatic intolerance — when standing brings on symptoms such as palpitations, lightheadedness and fatigue. How is syncope diagnosed? Some causes of fainting include.
When someone faints, make sure that the airway is clear and check for breathing. The person should stay lying down for minutes. Most people recover completely. Fainting is usually nothing to worry about, but it can sometimes be a sign of a serious problem. If you faint, it's important to see your health care provider and find out why it happened. The information on this site should not be used as a substitute for professional medical care or advice.
Contact a health care provider if you have questions about your health. Fainting Also called: Syncope. Learn More Related Issues Specifics.
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