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Hypertension does not have any symptom but severe high blood pressure can increase the risk of stroke, kidney failure, aortic aneurysm, vascular dementia and heart attacks.
An ideal blood pressure is 120/80, Low blood pressure is considered to be 90/60 or lower. High blood pressure is when your readings are consistently equal to or more than 140/90mmHg.
Severe hypertension is when your systolic blood pressure is consistently at or above 180mmHg and/or the diastolic is consistently at or above 110mmHg.
Seek medical help if you experience any of these signs of severe high blood pressure- fatigue, chest pain, severe headache, irregular heartbeat, blood in the urine and difficulty in breathing.