What's the symptoms of blood pressure to high or to low?

Depends on degree: Mild or moderate changes in blood pressure will usually not produce any symptoms. However, more significant (or sudden) changes in BP may produce symptoms. Low BP may produce dizziness, weakness or malaise, sometimes with blurry or spotty vision, shakiness or even nausea. Conversely, high BP may produce headache or pulsatilla pressure, sometimes with blurry vision or nausea.