Serious head injuries or other nervous system damage may also cause low blood pressure. Other causes are also possible. In some cases, no cause can be found. Some people always have a blood pressure that is low compared to other people, but normal for them. They may not have any symptoms from their low blood pressure because it is normal for them.
Prevention is related to the cause.
Avoiding dehydration can prevent cases due to this cause. Avoiding medications known to cause low blood pressure can prevent cases due to this cause. A person who takes medication to treat high blood pressure is instructed to not double up on medication if he or she misses a dose. This can lead to low blood pressure. Blood pressure is usually measured with a tool called a blood pressure cuff.