For the last 5  years , I have been  continuously measuring bp two times daily , in dec month suddenly my bp increased at doctor clinic 180/100 while it was normal at home , generally my bp remains normal, but in anxiety it shoots up , ECG ,TMT ,ECO etc normal I want to know when I measure bp at home with an automatic omron machine After pressing the start button it goes up to 190 highest then bp comes to normal 120/78 From last one month After pressing the start button it goes up to 220 then bp comes to normal 120/78 Why it is ??