What is the difference between high blood pressure and stress?

Stress can be a causative factor in high blood pressure. A person, in theory, can have stress and not have HBP.

Stress could cause high blood pressure.
High blood pressure is a medical finding, and it raises your risk for heart attack, stroke, and other cardiovascular diseases. Stress is a psychological phenomenon, usually involving a stage where one assesses the situation, and a stage where one feels there are not enough resources to deal with the situation.

Stress can cause high blood pressure. However, stress has many effects, including raising corticosteroid levels, patterns of brain activity, and lowering immune response.

High blood pressure can be caused by things other than stress, including narrowed or hardened arteries, a deficient arteriole relaxation response, and certain drugs or chemicals. Certain families carry alleles that predispose to high blood pressure, even in the absence of stress.
Stress is working more than the body level or working beyound the level you can work upon , whereas the Blood pressure is disease which can occur because of one the reason of stress but other reason such Blood suger , high calrio food , less amount of exercise or no exercise.
Experience
Between blood pressure and stress is have slightly difference.
Because of over stress we got a high blood pressure. Hearing a sudden news its makes a stress is use to get a high blood pressure.

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stress can cause high blood pressure yes, but high BP might just be a one-off occurence. only if recorded as high over several times does high BP become diagnosed as hypertension, and only then does it become a risk factor for disease.

many of us will experience high BP and not know it unless it's your fear of the doctor when you step into the clinic that's causing it. heh. keep those stress levels down, live heathily, and everything else is basically taken care of!