Blood pressure of 56 and 105 is generally considered to be 105mmHg systolic and 56mmHg diastolic, which is not normal and is hypotensive. The normal range of blood pressure for a normal adult in a quiet state is 90-139mmHg systolic and 60-89mmHg diastolic. whereas systolic blood pressure of 105mmHg and diastolic blood pressure of 56mmHg with normal systolic blood pressure but lower than normal diastolic blood pressure is not normal as it can be diagnosed as low blood pressure. Hypotension may be caused by physiologic factors, hemorrhage, dehydration, infection, etc. Congenital heart disease, chronic heart failure, etc. cannot be ruled out. Dizziness, nausea and other discomforts usually occur. If the hypotension is caused by hemorrhage, timely blood transfusion is needed to replenish blood volume; while the hypotension caused by trauma, infection and other factors needs timely rehydration and anti-infection treatment. If necessary, you can choose volume expanders, vasoconstrictors and other drug therapy, such as fludrocortisone, midodrine hydrochloride, octreotide and so on. When the above symptoms appear, it is recommended to go to the hospital in time to avoid delaying the best time for treatment.