Most importantly, vasovagal syncope is harmless and doesn’t require treatment. As the blood flows straight down to your legs, it leaves the brain and briefly causes you to lose consciousness. The heart rate suddenly slows, and the blood vessels in the legs dilate. Vasovagal syncope occurs when the components of the nervous system that regulate heart rate and blood pressure respond to a trigger stimulus, such as the sight of blood or something else emotionally distressing. THC also increases overall heart rate, affecting the blood pressure drop and contributing to passing out. This effect is one reason individuals with high blood pressure (hypertension) use medical marijuana, but for those with already low blood pressure, the drop can cause fainting. THC, one of the main cannabinoids in medical marijuana, is a vasodilator, meaning it expands blood vessels. One such aspect is the drop in blood pressure caused by consuming cannabis. Other types include carotid syncope, which occurs when your carotid artery is constricted, and situational syncope, triggered by things like urinating and coughing.Ī few factors explain why using marijuana may cause an individual to experience vasovagal syncope. Some people experience fainting spells when they use cannabis due to a type of fainting called vasovagal syncope. ![]() The Connection Between Marijuana and Fainting While the experience is scarce, it’s good to know why people faint when using marijuana and how to mitigate or prevent the incident before it occurs. ![]() The sudden drop in pressure surprises the body, and, in very rare cases, a person passes out. ![]() Still, fainting - more specifically, “vasovagal syncope” - is a surprising and unpleasant side effect that a small number of people may experience.Īccording to some researchers, these blackout periods occur due to THC lowering blood pressure in the body. Most people can use cannabis without any issues outside of a dry mouth and red eyes.
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