Anormal readingis typically 120 over 80 (120/80 mm Hg).
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What Causes Sudden High Blood Pressure?
High blood pressure can be sudden or prolonged.

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In some cases, the cause of hypertension is unknown.
When that happens, it is referred to as primary hypertension.Secondary hypertensionoccurs with a known cause.
Conditions That Cause High Blood Pressure
Health conditions can drive secondary high blood pressure.
Conditions include:
Lowering Blood Pressure During Pregnancy
High blood pressure during pregnancy can be serious.
Any medication prescribed to you was done so for a reason.
Because of that, taking your medication as prescribed is essential unless your healthcare provider tells you otherwise.
You will likely be monitored for high blood pressure and other side effects when you begin new medications.
What Causes High Blood Pressure Spikes?
A spike in blood pressure pops up if your range reaches 180200 mm Hg.
These instances cause temporary spikes in blood pressure that return to normal after the cause has been eliminated.
What Causes High Blood Pressure Without Symptoms?
High blood pressure may cause some symptoms to develop.
This is especially true if you have primary or essential hypertension.
How Does High Blood Pressure Feel?
Identifying Ideal Blood Pressure Levels
Blood pressure levels are measured by systolic and diastolic readings.
Systolic is the first number and measures the pressure against an artery wall when the heart squeezes or beats.
A medical professional will determine the cause and what you might do about it.
Harvard Health Publishing Harvard Medical School.Coffee and your blood pressure.
UK National Health Service.Causes: High blood pressure (hypertension).
UK National Health Service.High blood pressure (hypertension) and pregnancy.
doi:10.7759/cureus.11988
American Heart Association.Understanding blood pressure readings.