Hypertension

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Hypertension | Normal blood pressure at rest is within the range of 100–140 mmHg systolic (top reading) and 60–90 mmHg diastolic (bottom reading). High blood pressure is said to be present if it is often at or above 140/90 mmHg.
Hypertension is classified as either primary (essential) hypertension or secondary hypertension;

Primary (essential) hypertension
For most adults, there’s no identifiable cause of high blood pressure. This type of high blood pressure, called essential hypertension or primary hypertension, tends to develop gradually over many years.

Secondary hypertension

Various conditions and medications can lead to secondary hypertension, including:

• Kidney problems
• Adrenal gland tumors
• Thyroid problems
• Certain defects in blood vessels you’re born with (congenital)