The side effects of enhanced MRI are mainly the following: First, the effect of noise, the noise of MRI is greater than 90 decibels. Second, the impact of space limitations, claustrophobic patients will feel significant discomfort. Third, enhanced MRI due to the intravenous injection of contrast agent before the examination, a small number of people will have adverse reactions. Mild allergic reactions will result in nausea, dizziness, throat fever, skin redness, sneezing, etc. Moderate allergic reactions will result in mild laryngeal edema, massive hives, etc. Severe allergic reactions will result in severe tracheal and bronchial edema and spasms as well as decreased blood pressure.