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Cardiovascular health

High blood pressure: monitoring and warning signs

Learn why high blood pressure can go unnoticed, how to manage it, and when urgent medical attention is needed.

Illustration of blood pressure being measured with an arm cuff and gauge

Key points

  • High blood pressure often causes no symptoms; measuring it is how it is detected.
  • A diagnosis cannot be made from a single isolated reading.
  • Prescribed treatment and healthy habits reduce the risk of heart attack, stroke, and kidney damage.

What high blood pressure means

  • Blood pressure has two values: systolic, when the heart contracts, and diastolic, when it relaxes.
  • A high reading can result from pain, stress, recent exercise, caffeine, tobacco, or incorrect measurement technique.
  • If readings are repeatedly high, record the date, time, and symptoms, and arrange a medical assessment.

How to help manage it

  • Take medicines exactly as prescribed and do not stop them even if you feel well.
  • Reduce salt and highly processed foods, remain appropriately active, avoid smoking, and limit alcohol.
  • Monitor weight, blood sugar, and cholesterol when appropriate, and attend scheduled follow-up appointments.
  • For home measurements, rest for five minutes, support your back and feet, position your arm at heart level, and use the correct cuff size.

What to do with a very high reading

  • If blood pressure is 180/120 mmHg or above, remain at rest and repeat the measurement after at least one minute.
  • If it remains very high, seek immediate medical advice, even without symptoms.
  • If chest pain, shortness of breath, weakness, confusion, trouble speaking, or visual changes are also present, seek emergency care immediately.

Warning signs and when to seek care

  • Severe chest pain or pressure
  • Difficulty breathing
  • Weakness or numbness on one side of the body
  • Confusion, fainting, or trouble speaking
  • Sudden visual changes or severe headache

What not to do

  • Do not double or add medication doses on your own.
  • Do not stop treatment because one reading is normal.
  • Do not use home remedies instead of medical assessment.
  • Do not drive yourself if you have neurological symptoms or severe chest pain.

Medical references

WHO — High blood pressure PAHO/WHO — High blood pressure

If you have symptoms, risk factors, or questions about your situation, arrange a professional medical assessment.

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