Blog: Tetanus Vaccine

Fainting After a Tetanus Shot: Understanding Vasovagal Syncope

Oct 8, 2026

Fainting after receiving a tetanus shot can be an unsettling experience. For some people, it happens almost immediately. They may begin to feel lightheaded, warm, nauseated, or dizzy before briefly losing consciousness. When this occurs shortly after a vaccination, it is natural to wonder whether the vaccine caused a serious reaction. In many cases, however, fainting around the time of a vaccination may be caused by vasovagal syncope. This is a temporary response of the...