When a person is under a lot of stress, the brain sends signals to release different hormones that can increase blood pressure.
There is no scientific evidence to explain how stress causes high blood pressure, however experts say that stress can be linked to other behaviors that increase the blood pressure, like drinking alcohol, smoking, poor sleeping habits, among others.
Smoking is one of the main risk factors for many cardiovascular diseases, including hypertension. Smoking can cause an impairment of the endothelial function, vascular inflammation and stiffness, and an alteration of certain factors related to coagulation (like platelets).
If the walls of the blood vessels are stiff, the heart needs to increase the force with which it pumps the blood into blood vessels, and this causes high blood pressure. Likewise, smoking can stimulate the sympathetic nervous system, which causes an acute increase in blood pressure. In the long term, smoking can also cause severe damage to the arteries of the kidneys and brain, which also causes secondary hypertension.