Magnetic resonance examination is widely used and is a non-radiation and non-invasive examination item, which generally does not cause pain. During the examination, some people may feel discomfort, which varies from person to person and may include local heat production and vibration, claustrophobia, etc. 1. Local heat production and vibration: Since MRI uses a strong magnetic field plus radio frequency pulses, during the examination, the human body may feel an increase in body surface temperature and body vibration, and even fever, which is a normal phenomenon and need not be 2, claustrophobia: MRI requires lying on the bed into a small space, some people will appear anxiety, fear, chest tightness, and even respiratory distress, dyspnea, etc., for claustrophobic people are not recommended to do MRI; 3, other feelings: MRI flat scan does not require contrast, while in the MRI enhancement scan requires injection of gadolinium contrast agent, at this time there may be needle-like pain, but also Allergy may occur, but compared to CT enhancement iodine contrast agent has less chance of allergy, it is recommended to stay for 30 minutes after the enhancement scan before leaving, and drink more water after the examination to speed up the discharge of contrast agent.