For patients with sinus arrhythmia, it is generally not a problem to join the army. Sinus arrhythmia is not a disease in itself, but a physiological abnormality, such as deep inhalation during the electrocardiogram, which may lead to sinus arrhythmia. If you have a sinus arrhythmia, you will be advised to re-examine the ECG during the military medical examination, and it is likely that the condition will disappear and you will naturally pass the medical examination. This sinus arrhythmia does not occur all the time, but only once in a while, because the patient’s heart is beating. It is also important to note that when performing another ECG, patients are advised not to breathe deeply and to try to breathe calmly to help avoid this condition.