Hi welcome to Ask The Doctor,
The exact causes of high blood pressure are not known, but several factors and conditions may play a role in its development, including: Smoking, Being overweight or obese, Lack of physical activity, Too much salt in the diet, Too much alcohol consumption (more than 1 to 2 drinks per day), Stress, Older age, Genetics, Family history of high blood pressure, Chronic kidney disease, Adrenal and thyroid disorders.
The average bp is 120/80 but if you normally are 100/60 and you get an average reading there is something wrong. 136/70 isn't a good one though. Your blood pressure should be 120/80 or less. If the diastolic number (the bottom number) goes over 90, you need to have it checked. Your pulse should be somewhere between 70-100.
Hope this helps.
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