If your blood pressure reading is 90/60 or lower, like 63/38, you have low blood pressure. According to the American Heart Association, chronically low blood pressure is consider dangerous only if it causes noticeable signs and symptoms, such as:
Dizziness or lightheadedness
Fainting (called syncope)
Dehydration and unusual thirst - Dehydration can sometimes cause blood pressure to drop. However, dehydration does not automatically signal low blood pressure. Fever, vomiting, severe diarrhea, overuse of diuretics and strenuous exercise can all lead to dehydration, a potentially serious condition in which your body loses more water than you take in. Even mild dehydration (a loss of as little as 1 percent to 2 percent of body weight), can cause weakness, dizziness and fatigue.
Lack of concentration
Blurred vision
Nausea
Cold, clammy, pale skin
Rapid, shallow breathing
Fatigue
Depression
As long as no symptoms are present, low blood pressure is not a problem. However, if your blood pressure is normally higher or if you are experiencing any of the symptoms listed above, your low pressure may have an underlying cause.
Please refer on the American Heart Association blood pressure chart.
Understanding Blood Pressure Readings via kwout
Know more about Blood Pressure Numbers at the American Heart Association and WebMD.
Tip! See Low Blood Pressure Diagnosis & Treatment at WebMD.