Blood pressure 112/56mmHg is not normal, normal blood pressure is systolic blood pressure between 90mmHg-140mmHg, diastolic blood pressure between 60mmHg-90mmHg, the patient’s systolic blood pressure is normal, diastolic blood pressure is significantly lower than the normal range. It may be physiological low blood pressure or pathologic. 1. Physiological low blood pressure: it is usually seen in the elderly and children, the elasticity of blood vessels of the elderly decreases, and the development of blood vessels of children is imperfect, so there will be physiological lowered blood pressure. 2. Pathological low blood pressure: commonly seen in aortic valve closure insufficiency. The aortic valve is designed to keep blood in the aorta to maintain blood supply. If the aortic valve closure is insufficient, it will lead to blood flow out of the aorta and a decrease in diastolic blood pressure. Blood pressure 112/56mmHg can also be seen in anemia and other causes, if the symptoms of blood pressure 112/56mmHg, persistent and unrelieved, you need to seek medical treatment.