If the patient’s heart rate at rest is 56 beats per minute, although it is not the standard heart rate and the value does not exist within the standard range, it is generally not harmful to the human body. An adult’s standard heart rate at rest ranges from 60-100 beats/min, but as we age, the heart rate gradually slows down and the blood pressure gradually rises, so the heart rate gradually slows down, in line with a person’s developmental pattern. And if the patient himself has cardiovascular disease, sometimes it is necessary to artificially control the heart rate at 55-60 beats/min. If the patient is not taking any oral medication, his heart rate is 56 beats/min. In this case, the relative patient is also more beneficial and not prone to trigger the symptoms of angina pectoris and heart failure. However, if the patient has just developed a slowed heart rate, it is important to find out further if it is due to hyperkalemia, or hypothyroidism. This is because hyperkalemia can lead to cardiac arrest and sudden death, while hypothyroidism can induce myocardial ischemia, and sometimes lead to uncomfortable symptoms of palpitations and panic.