Below are causes that can all negatively stress your body and increase the blood pressure
1. External sources - such as your job, family trouble, financial problems, etc.
2. Internal sources -
2 a. Excess weight,
2 b. Lack of exercise,
2 c. Lack of sleep,
2 d. Heavy metals
2 e. Nutritional deficiency- omega 3, Magnesium, Co Q10, Arginine
So lose weight, reduce stress, get good sleep, detoxify heavy metals, exercise regularly, and correct any nutrient deficiencies.