My daughter has low blood pressure she is 19 yrs old..why?

More information: Low blood pressure may be an issue if your child has symptoms from it. It may change with position which may cause symptoms as well. Often if symptoms include dizziness, lightheaded ness or fainting, drinking more water (on the order 80+ ounces daily) can help tremendously.

Blood pressure: 'low blood pressure' is relative. If she feels fine and is otherwise normal , that is just her normal