(CNN) — He was healthy and fit at 54, an avid runner with no vices — he didn’t smoke, drink or do drugs. So when he suddenly experienced left-sided weakness, numbness and difficulties with balance, walking, swallowing and speech, a family member rushed him to a nearby stroke clinic.

“His blood pressure was sky high — about 254 over 150 millimeters — yet when you looked at him you’ve never know it, because he looked so well. That’s why we call hypertension the silent killer,” said Dr. Sunil Munshi, a consulting physician at Nottingham University Hospitals NHS Trust in the United Kingdom.

Munshi is the senior author of a case report about the man, a warehouse worker from Sherwood, Nottingham, whose name was withheld to protect his privacy. The paper was published Tuesday in the journal BMJ

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