Low high pressure and normal low pressure may be related to certain diseases, medications, or may be caused by physiologic hypotension. 1. Diseases: hypothyroidism, anemia and other diseases will appear high pressure low pressure normal; severe wasting disease, bleeding, infection, etc., can also cause high pressure low pressure normal. 2. Drugs: calcium antagonists, common drugs are nifedipine, felodipine, the drug to reduce systolic blood pressure is the main, diastolic blood pressure decline is not obvious, the use of high blood pressure can occur after the low low pressure normal. 3. Other: physiological hypotension, mainly seen in adolescent women, easy to appear low pressure normal, high pressure is low, most of the genetic, physical fitness, lack of exercise and other factors. There are a lot of factors that cause high pressure and low pressure to be normal, so it is recommended to go to the hospital in time to find out the cause and treat it in time.