Vasovagal reactions are also short-lived, and resolve after a while, making it much different from anaphylaxis. Most importantly, events related to fainting or lightheadedness, while they do require attention, should be especially looked into if a person also reports adverse reactions such as swelling, difficulty in breathing, nausea, vomiting, skin reactions, extremely low blood pressure as well. Often there is prolonged fatigue after a faint. For one, while vasovagal reactions, fainting strike within the first few minutes of injection of the dose, allergic reactions happen when an allergen is absorbed, and then consequently recognized by the immune system, which can take upto 20-30 minutes post-vaccination to show up.Īllergic reactions are also most likely to afflict those who have a history of reactions, or are sensitive to one or more ingredients present in the vaccine. The symptoms of fainting can vary depending on the cause, but typically include dizziness, lightheadedness, nausea, sweating, and a rapid or irregular heartbeat. When coming round after a faint, the person often feels awful, sickly and may vomit, or even have diarrhoea. You come around after a few seconds and feel back to normal. While experiencing side-effects such as fainting and extreme dizziness could be worrisome, experts do point out that these side-effects, or vasovagal reactions differ from allergic reactions or anaphylaxis (which require immediate attention). It isnt the same thing as a seizure which usually makes you jerk. Convulsive syncope is characterized by small jerking motions after passing out with spontaneous and complete recovery.
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