Low pressure and normal high pressure usually have the following factors: 1, age, for middle-aged people and young people, low pressure and normal high pressure. 2, gender factors, women are prone to low pressure and normal high pressure. 3, relatively poor rest and sleep, plant nerve dysfunction, cardiac phytoconstituent disorders, will also have low pressure and normal high pressure. 4, endocrine system diseases, such as hypothyroidism or anemia, will also have low blood pressure and normal high pressure. 5, endocrine system diseases, such as hypothyroidism or anemia, will also have low blood pressure and normal high pressure. The premise that the blood supply to the heart is inadequate also results in unstable blood pressure, especially when low pressure is low but high pressure is normal.5. Endocrine system diseases, such as hypothyroidism or anemia, can also occur.