9 Symptoms of High Blood Pressure

High blood pressure symptoms, such as blurry eyesight or headache, generally only occur when blood pressure is already too high, called an hypertensive crisis. That means that a person can have high blood pressure and not present any symptoms at all.

If you suspect your blood pressure might be high, it is recommended that you measure it as soon as possible, at home or at a drugstore. To measure your blood pressure correctly it's important you urinate and rest for around five minutes before you do so. If the blood pressure is in fact raised, you should make an appointment with a GP.

9 Symptoms of High Blood Pressure

Main symptoms

High blood pressure symptoms can include:

  1. Nausea;
  2. Frontal headache;
  3. Pain in the back of the head;
  4. Sleepiness;
  5. Buzzing sound;
  6. Blood-shot eyes;
  7. Double vision or cloudy vision;
  8. Breathing problems;
  9. Heart palpitations.

These symptoms generally happen when blood pressure is already too high, and if this happens, you will need to go to the emergency room and take medication prescribed by a cardiologist immediately.

Although high blood pressure is a silent condition, it can cause very serious health problems such as heart failure, stroke or loss of eyesight, and so you need to check blood pressure at least once a year. 

What to do if you have a hypertensive crisis 

When pressure increases suddenly and symptoms like headache, especially at the back of the head, sleepiness, difficulty breathing and double vision appear, it's important to take the medication prescribed by the doctor and rest, trying to relax. Nevertheless, if blood pressure is higher than 140/90 mmHg after an hour, you need to go to the hospital to have intravenous antihypertensive medication. 

If blood pressure does not lead to symptoms, have some freshly squeezed orange juice and try to relax. After an hour, measure your blood pressure again and if it's still high, go to a hospital to get help. Learn some home remedies that can help lower blood pressure.

High blood pressure during pregnancy

High blood pressure during pregnancy, scientifically known as pre-eclampsia, can lead to strong abdominal pain and swollen feet and legs, especially at the end of pregnancy. If this happens it is important to visit an obstetrician as soon as possible to start adequate treatment and prevent serious complications, such as eclampsia, which can harm the baby.

See what to do to lower high blood pressure without using medication.

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  • JUDD, E.; CALHOUN, D. A. Apparent and true resistant hypertension: definition, prevalence and outcomes. J Hum Hypertens. 28. 8; 463-8, 2014
  • MINISTÉRIO DA SAÚDE BRASIL. Cadernos de atenção básica: estratégias para o cuidado da pessoa com doença crônica - hipertensão arterial sistêmica. 2014. Available on: <http://bvsms.saude.gov.br/bvs/publicacoes/hipertensao_arterial_sistemica_cab37.pdf>. Access in 27 Apr 2020
  • MINISTÉRIO DA SAÚDE. Hipertensão (pressão alta): o que é, causas, sintomas, diagnóstico, tratamento e prevenção. Available on: <http://www.saude.gov.br/saude-de-a-z/hipertensao#sintomas>. Access in 27 Dec 2019
  • SOCIEDADE PORTUGUESA DE HIPERTENSÃO. Hipertensão arterial (HTA): o que é?. Available on: <https://www.sphta.org.pt/pt/base8_detail/24/89>. Access in 16 Oct 2020
  • AMERICAN HEART SOCIETY. Hypertensive Crisis: When You Should Call 911 for High Blood Pressure. Available on: <https://www.heart.org/en/health-topics/high-blood-pressure/understanding-blood-pressure-readings/hypertensive-crisis-when-you-should-call-911-for-high-blood-pressure>. Access in 27 Dec 2019
  • ELLIOT, W. J. Systemic hypertension. Curr Probl Cardiol. 32. 4; 201-59, 2007
  • FUNDAÇÃO PORTUGUESA DE CARDIOLOGIA. Tudo o que precisa saber sobre Hipertensão arterial. 2013. Available on: <http://www.fpcardiologia.pt/wp-content/uploads/2013/08/Brochura-CRC-N%C2%BA-9-Hip.-Art..pdf>. Access in 16 Oct 2020
  • AMERICAN HEART SOCIETY. What are the Symptoms of High Blood Pressure?. Available on: <https://www.heart.org/en/health-topics/high-blood-pressure/why-high-blood-pressure-is-a-silent-killer/what-are-the-symptoms-of-high-blood-pressure>. Access in 27 Dec 2019
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