What is hypertension and types of hypertension

Hypertension :                     Hypertension is a clinical condition characterized by persistence rise of blood pressure above the normal range in respect of age and sex. Hypertension occurs when diastolic pressure is greater than 90 mm of Hg and systolic pressure is above 140 mm of Hg. Hypertension is of 2 types :      Primary or essential hypertension    Secondary...

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