Low blood pressure (hypotension) symptoms may include: 
Blurred or fading vision
Dizziness or lightheadedness
Fainting
Fatigue
Trouble concentrating
Nausea
 For some people, low blood pressure may be a sign of an underlying health condition, especially when it drops suddenly or occurs with symptoms. A sudden fall in blood pressure can be dangerous. A change of just 20 mm Hg — a drop from 110 mm Hg systolic to 90 mm Hg systolic, for example — can cause dizziness and fainting. And big drops, such as those caused by uncontrolled bleeding, severe infections or allergic reactions, can be life-threatening. mm Hg mm Hg mm Hg Extreme low blood pressure can lead to a condition known as shock. Symptoms of shock include: 
Confusion, especially in older people
Cold, clammy skin
Decrease in skin coloration (pallor)
Rapid, shallow breathing
Weak and rapid pulse
