Short PR interval refers to the shortening of the interval between the starting point of the P wave and the starting point of the QRS complex wave, which may be caused by physiological factors such as staying up all night, exercising, or diseases such as preexcitation syndrome or premature beats. Under normal circumstances, the normal value of the PR interval is 0.12 to 0.20 seconds. A short PR interval means a shortening of the time from the beginning of the P wave to the beginning of the QRS wave cluster, which means that the PR interval is less than 0.12 seconds. Relevant studies have shown that there are many reasons for the shortening of PR interval, which may be caused by physiological factors such as staying up late at night, exercising, emotional stress, etc., and does not require special treatment. However, shortened PR interval may also be caused by pre-excitation syndrome, premature beats, atrioventricular junctional rhythm and other diseases, and then you need to actively cooperate with the doctor to take standardized treatment for the specific causes. To summarize, when patients are found to have shortened PR interval, they need to do further relevant examinations to clarify the specific causes, so as to avoid delaying the condition.