And so do our bodies. If so, your heart rate speeds up under stress. Or maybe it's your blood pressure that increases those 100 times a day, so your high blood pressure eventually is high all the time. Some people dump extra acid into their stomachs and have burning sensations or ulcers. Stress also results in depressed immune systems, resulting in more frequent illness.
Migraine headaches follow a different pattern.
They usually happen on weekends after the stress is over. You take your last final exam, and then you get a migraine. But this is understandable. Fifteen thousand years ago, after fighting a tiger, persons recovered for two or three hours. This excessive dilation sets off nerves around blood vessels.