Cardiac angiography is not painful. Cardiac angiography is a more complex procedure, but it is very less invasive. Cardiac imaging is also a surgical procedure, but it is a minimally invasive procedure, unlike traditional surgical procedures. Cardiac angiography requires the selection of the starting point of the puncture, such as the radial or brachial artery or femoral artery of the patient, and after the puncture, a guidewire is fed, which follows the course of the artery all the way into the heart vessels. This process is painless for the patient, except for a slight pain during the puncture, but this pain is completely tolerable and is similar to the pain of a needle during an IV infusion. If the patient is having a cardiac angiogram done by puncturing the radial artery, he or she can move around normally after the procedure. If the femoral artery is punctured, the patient will need to be bedridden for 12 hours after the procedure, and normal activities will be allowed only after 12 hours. Cardiac angiography requires contrast media, and attention should be paid to contrast nephropathy and allergy to contrast media.