Right bundle branch block is a very common type of heart block. Normal people can develop right bundle branch block, and its severity is very small, basically it will not have a special impact on life expectancy and quality of life. However, if the patient does not have right bundle branch block, but has a sudden onset of right bundle branch block, or if right bundle branch block alternates with left bundle branch block, then this type of block is known as triple-branch block, and the possibility of cardiac arrest is very high, and a pacemaker should be implanted at the earliest possible time. Therefore, to determine whether right bundle branch block is serious or not, it should be based on the previous medical history, (if) it was there before and has existed for a long time, it is not a big problem, and if it was not there before at all, but has appeared suddenly in the recent past, and the magnitude of the change has been relatively large, the severity of the problem will be a bit more serious.