Easy to be hungry after vaccination, may be caused by nervousness, blood sugar changes, digestive system dysfunction and other factors, need to analyze whether it is normal for different situations. 1. Tension. Vaccination if the emotional tension may lead to the body metabolism faster, after the vaccination will be hungry, this situation is normal, you can eat to supplement energy, do not eat spicy stimulation and seafood products, you can also drink a small amount of lukewarm water to be relieved. 2. Blood sugar changes. Some suspected diabetic patients with hunger after vaccination may be due to emotional factors caused by fluctuations in blood glucose, is an abnormal phenomenon, you can rest properly, monitor the blood glucose changes, and then be adjusted to maintain stable blood glucose. 3. Digestive system dysfunction. After vaccination, some patients may experience the side effect of digestive system dysfunction, which is also an abnormal phenomenon, and can be treated with medicines to improve digestion under the guidance of the doctor. At the same time, eat more easily digested food, avoid smoking and alcohol stimulation.