the time of day –blood pressure is normally lower overnight while you’re sleeping, rises a few hours before you wake up, and continues to rise during the day, reaching its highest mid-afternoon
how stressed or relaxed you are – you have lower blood pressure the more relaxed you are
how much exercise you do – initially, exercise will raise your blood pressure, but if you’re healthy and exercise regularly, your blood pressure will be low when you’re resting
temperature – a warm temperature may cause your blood pressure to fall
if you have recently eaten – blood is diverted to the gut when food needs to be digested, so the blood pressure elsewhere in your body falls