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Causes of fainting. Fainting (syncope) is caused by a temporary reduction in blood flow to the brain. Blood flow to the brain can be interrupted for a number of reasons. The different causes of fainting are explained below. Fainting is most commonly caused by a temporary malfunction in the autonomic nervous system.
Medication reaction or side-effect Medication side effects include nausea, vomiting, stomach upset, weakness, dizziness, seizures, and more. Fainting (vasovagal syncope) Before fainting, you might feel lightheaded, warm, nausea, a cold sweat, or have tunnel vision. Heart rhythm disorder Some heart rhythm disorders can cause a fluttering in the chest, shortness of breath, chest pain or dizziness.