If you have syncope and you have a family history of sudden cardiac death Syncope that is accompanied by palpitations or a sensation of rapid heartbeats Syncope occurring during exercise or strenuous physical exertion Other situations or illnesses that can cause syncope or mimic syncope include:īreath-holding episodes (typically in children 6 month to 2 years of age)Īneurysm or abnormality of the blood vessels of the brainĬertain symptoms that occur with syncope may suggest a more serious problem. This more commonly occurs in older adults. Blood pools in the legs, preventing a normal amount of blood from being pumped to the brain. This brief drop in blood flow to the brain causes a person to faint. ![]() This is a drop in blood pressure that occurs when a person has been standing for a while, or changes from a sitting to a standing position. The body again reacts to decreased blood flow to the brain by fainting. The heart muscle becomes weak and is not able to pump as well as normal. There may be problems with the heart muscle or one or more of the heart valves. This may cause a decrease of blood flow to the body, including the brain. Inflammation of the heart muscle, known as myocarditis, can also cause fainting. Structural heart disease (muscle or valve defects). This is a fairly rare cause of syncope, especially in children. ![]() A heart rate that is too slow, too fast, or too irregular to keep enough blood flow to the body, including the brain. This is the most common cause of syncope and can follow periods of extreme emotion. It's caused by a problem with overstimulating the nerves that have direct input on the heart and blood vessels. A sudden drop in blood pressure with or without a decrease in heart rate. Vasovagal syndrome (neurocardiogenic syncope). ![]() However, many different problems can cause a decrease in blood flow to the brain. The common reason behind each fainting episode is a temporary lack of oxygen-rich (red) blood getting to the brain.
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