Breast hyperplasia is not a contraindication to the New Crown booster shot, and breast hyperplasia or other breast diseases have not been found to cause side effects of the third New Crown shot. If a patient is taking oral medications such as estrogen and progesterone to relieve symptoms of hyperplasia during this time, consult with the vaccination center to confirm whether the medication is a contraindication to receiving the New Crown vaccine. There are also no clinical studies or data proving that the New Crown vaccine causes or aggravates breast hyperplasia. Patients should rest on the spot for 30 minutes after vaccination and stay to observe the symptoms. If there are any adverse reactions such as chest tightness, dizziness, localized redness or swelling, they can seek medical advice promptly to prevent symptoms of post-vaccination allergy.