Question
Two weeks ago, my child received the Japanese encephalitis vaccine, and two weeks later, I noticed that the child’s eyelids are swollen, urine output has decreased, and the color has darkened. I want to know if this is a normal reaction after vaccination.
Answer
After receiving the Japanese encephalitis vaccine, in most cases, the above symptoms do not occur. Common post-vaccination reactions include pain at the injection site, fever, and rash, which usually resolve on their own without specific treatment. For the observed eyelid swelling and urine abnormalities, it is recommended to get adequate rest, ensure sufficient high-quality sleep, and apply a moderate amount of cold compress. If the child does not have other discomforts, there is usually no need to worry excessively. To reduce nighttime urine output, it is appropriate to control fluid intake before bedtime.