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Health Conditions Discover Plan Connect. Medically reviewed by Heidi Moawad, M. What causes vasovagal syncope? What are the symptoms? When to see a doctor. When to get immediate medical care.
How is it diagnosed? What are the treatment options? Can vasovagal syncope be prevented? The bottom line. Faints Vasovagal syncope Show. Faints Vasovagal syncope. What happens during fainting? When does a fainting response occur? When in pain especially abdominal pain, or during a period.
After a long period of standing still in a queue or at a reception. After sitting very still, especially then standing. In warm surroundings in a restaurant, warm weather, standing in a hot shower or sauna. Directly after exercise. When you have not had enough rest. During illness, nausea or fever. Symptoms of Vasovagal fainting As the vasovagal fainting reaction begins, there is often light headedness, ringing in the ears, and feeling sweaty and nauseous. Advice Being susceptible to fainting is not a serious disease, but can be very frightening and frustrating to you and those around you.
Try to work out in which particular set of circumstances you are most likely to faint Then try to avoid these sets of circumstances eg stressed, long day, little food or drink, then out late to hot restaurant, beginning to relax, food arrives… When standing still eg in queues , move up and down on the balls of your feet, so your calf muscles squeeze blood back up to your heart, or stand cross-legged so you use more muscles to stay up, and stimulate your sympathetic system to keep up your blood pressure.
In certain cases, these nerves may give a wrong signal or be slow to respond to input received from the body. This may cause your blood vessels to open wide or cause them not to get more narrow when they need to. At the same time, your heartbeat may slow down. Blood can start to pool in your legs, and not enough of it may reach the brain. If that happens, you may briefly lose consciousness.
When you lie down or fall down, blood flow to the brain resumes. Fainting is the main symptom of vasovagal syncope. You may have symptoms before fainting such as:. If you lie down and elevate your legs at the first sign of these symptoms, you will often be able to prevent fainting. Not everyone notices symptoms before fainting, however.
When a person does faint, lying down restores blood flow to the brain. Consciousness should return fairly quickly. You might not feel normal for a little while after you faint. You might feel depressed or fatigued for a short time.
You may even feel nauseous afterwards and vomit. Some people have only 1 or 2 episodes of vasovagal syncope in their life. For others, it happens more often and with no warning. Benditt D, et al. Reflex syncope in adults and adolescents: Clinical presentation and diagnostic evaluation.
Reflex syncope in adults and adolescents: Treatment. Goldman L, et al. Approach to the patient with suspected arrhythmia. In: Goldman-Cecil Medicine.
Elsevier; Merck Manual Professional Version. Related Fainting during urination micturition syncope : What causes it? Mayo Clinic Press Check out these best-sellers and special offers on books and newsletters from Mayo Clinic.
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