High diastolic blood pressure is defined as a diastolic reading of 80 mm Hg or higher, with Stage 1 hypertension ranging from 80–89 mm Hg and Stage 2 hypertension at 90 mm Hg or higher. When the systolic (top) number is normal but the diastolic (bottom) number remains elevated, the condition is known as isolated diastolic hypertension (IDH), which is most commonly seen in young and middle-aged adults.

Causes and Risk Factors The exact cause of isolated diastolic hypertension is often unknown, but it is strongly associated with specific lifestyle and genetic factors:

• Obesity and high BMI: Being overweight or obese is a primary driver, linked to hormonal imbalances like increased aldosterone.

• Lifestyle habits: Smoking, heavy alcohol consumption, sedentary behavior, and diets high in sodium and low in potassium significantly increase risk.

• Medical conditions: Underlying issues such as obstructive sleep apnea, kidney disease, thyroid disorders, and Type 2 diabetes can contribute to elevated diastolic pressure.

• Medications: Certain drugs, including NSAIDs (e.g., ibuprofen), birth control pills, and decongestants, may temporarily or chronically raise blood pressure.

Health Risks and Treatment Ignoring high diastolic blood pressure can lead to severe complications, including heart attack, stroke, and kidney failure. Research indicates that for individuals aged 40 to 89, every 10 mm Hg increase in diastolic pressure doubles the risk of death from stroke and ischemic heart disease. Treatment typically involves lifestyle modifications such as weight loss, regular exercise, and stress management, alongside medications like calcium channel blockers or ACE inhibitors if lifestyle changes are insufficient.