Low blood pressure may be caused by systemic, cardiac, and inflammatory factors. The danger is that it can cause organ ischemia and, in severe cases, organ failure. 1. Systemic factors: when the body is in a dehydrated state due to high fever, massive diarrhea, etc., the circulating blood volume will be insufficient, thus leading to low blood pressure. 2. Cardiac factors: If the heart does not contract well, it will reduce the volume of ejected blood, which is insufficient to maintain peripheral pressure, thus resulting in hypotension. 3. Inflammatory factors: such as vasculitis, which causes excessive vasodilatation of the blood vessels, leading to low blood pressure. Low blood pressure can cause the brain to experience a transient lack of blood supply, such as cerebral hypoxia, ischemic injury, or ischemic and hypoxic injury to the liver, kidneys, digestive tract, etc., and in severe cases can cause organ failure. Note that if you experience low blood pressure for a long time, you should seek medical attention.