Is 140/90 high?
Yes. Under the AHA categories, 140+ systolic or 90+ diastolic is stage 2 high blood pressure. Under some other guidelines it’s labelled differently, but it’s consistently a reading worth acting on.
What to do next
One reading isn’t a diagnosis. Recheck when calm and rested, ideally with a few home readings across different days. Take the results to your GP or nurse, who may recommend lifestyle changes, monitoring, or treatment based on the pattern and your overall risk.
What can raise a single reading
Stress, a recent coffee, exercise, a full bladder, talking during the measurement, or an ill-fitting cuff can all push a reading up. Good technique matters — sit quietly for five minutes first and support your arm at heart height.