Dizziness after vaccination is usually an adverse reaction to the vaccine, so take rest, sleep and drink more water. Usually, although the vaccine is inactivated or attenuated, it is a foreign protein that is different from the human body, and there are also some immune adjuvants, so the human body will have certain immune reactions to the foreign protein and immune adjuvants. These include both favorable and unfavorable immune reactions. That is why it is possible to experience dizziness after vaccination. However, dizziness may also not be overly related to the vaccine, but only due to excessive fatigue or fasting. In addition, overstimulation of the vaccine and fear of pain may also cause these symptoms. Easing the mood and taking deep breaths may lead to improvement. If the symptoms persist or get progressively worse, or if a rash, chest tightness, or fever occurs at the same time, you should consider whether an allergic reaction has occurred. If an allergic reaction has occurred, the doctor will treat the different cases after seeking medical attention, and treat the patient’s allergy with rehydration and fever reduction. If the dizziness is not relieved or even gradually increased after rest, or if it is accompanied by headache and runny nose, you should consider whether other diseases such as cold are present and you need to go to the hospital promptly.