4. Hormones
Low blood pressure could be brought on by your hormones. Progesterone in women can be the main cause of a person developing low blood pressure.
This is one of the reasons that many pregnant women end up having low blood pressure during pregnancy as the amount of progesterone in the body during this time will increase.
Other things that may affect your hormones could also be the cause, such as birth control medications. If you have started birth control or you are pregnant, this may be the reason you are suffering from low blood pressure.