what causes blood pressure to be high one day and low the next

It's normal for blood pressure level to vary somewhat throughout the day. Stress, do, and slumber tin all make a difference. But if your claret pressure frequently changes significantly from one healthcare visit to another, there may a problem.

Studies have institute that visit-to-visit changes in blood pressure are sometimes linked to a higher risk of heart disease and early decease.

This article explains why your blood force per unit area numbers may be loftier sometimes and normal other times. It also offers advice about when to see a healthcare provider.

Verywell / Cindy Chung

Measuring Errors

First, information technology's important to brand certain that your blood pressure really is irresolute.

If you lot've used a habitation blood pressure cuff or the machine in a grocery shop, the changes might actually exist errors in how your blood pressure level is measured.

Home blood pressure monitoring can be constructive. But you need preparation to exist certain you lot're using the equipment correctly. If yous haven't been trained, your numbers could vary.

Drugstore machines—the kind where you to sit in a chair and put your arm through a cuff—are known for not being accurate.

To preclude errors, bring your home blood pressure monitor to your adjacent healthcare appointment. Work with your doctor or nurse to exist sure you're using it correctly. Yous should as well bring your readings to run across if you get like numbers in the office.

Some healthcare providers recommend convalescent claret pressure monitoring. That's where you lot habiliment a device at home. The device takes your blood pressure over a one- or two-24-hour interval period. Information technology checks every 15 to 20 minutes during the 24-hour interval and every 30 to lx minutes at nighttime.

This option isn't always available. Plus, it can be costly. The Centers for Medicare & Medicaid Services does cover this diagnostic examination. But other insurance coverage can vary.

Medical Causes

Experts are exploring why blood pressure varies from visit to visit. Information technology may exist that people with claret pressure swings accept a blood vessel problem. The ups and downs in their readings could be a clue that they're at a higher risk of having a heart assail or stroke.

Very rarely, blood pressure changes come up from apheochromocytoma—a tumor in the adrenal gland. These tumors are usually not cancer.

Medical Settings

Sometimes just being in a medical setting is plenty to throw off your readings.

With white glaze hypertension, a person's blood pressure is loftier at a healthcare provider'due south part, but normal when at habitation. Experts retrieve the reason could be stress from being in a medical office. That's why nurses oftentimes wait for yous to remainder for five minutes earlier they take a reading.

Another option is to take your claret pressure twice. If there is a difference of more than than v millimeters of mercury (mmHg), the readings should be checked again.

Masked hypertension is the reverse problem. Information technology occurs when readings in a medical office are normal. Later, the numbers are high.

To sort these issues out, a healthcare provider may recommend home monitoring or ambulatory claret pressure monitoring.

Home monitoring may besides be a proficient idea for:

• Claret pressure readings that stay high fifty-fifty when medications increment
• Blood pressure readings that stay low even when you take medication

High Blood Pressure

If you lot notice some high blood pressure readings among the normal ones, it could be that yous take hypertension but have not been diagnosed even so.

Experts don't know exactly how high blood pressure develops. It may because your genes and your environment affect how your heart and kidneys work. Information technology may as well be due to gradual atherosclerosis, or hardening of the arteries.

Some risk factors raise the chances of having high blood pressure level. They include:

• Age (the chances get up as you go older)
• Family unit history
• Obesity
• High-sodium diet
• Not plenty physical action
• Also much alcohol

Sometimes another health status causes high claret pressure. That's called secondary high claret pressure considering it happens as a effect of a trouble somewhere else in your torso. Some medications tin can also cause secondary high blood pressure.

Loftier blood pressure can come from :

• Obstructive slumber apnea or other breathing problems
• NSAIDs, antidepressants, and other medications
• Endocrine and hormone disorders

Hypertension Healthcare Provider Discussion Guide

Get our printable guide for your next healthcare provider's appointment to assist you lot ask the correct questions.

Download PDF

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Summary

It's normal for your claret force per unit area to go up and down a little during the day. If you're using a home blood pressure cuff, the readings might be off. The same holds true for drugstore equipment.

It's also possible that your readings vary considering you're stressed by beingness in a healthcare setting. If that's the case, your healthcare provider might ask you lot to apply a device that tracks your blood force per unit area at domicile for a twenty-four hour period or two.

It is possible that differences could be related to a health condition. If you're non getting consistent readings, information technology'south important to see your healthcare provider near the consequence.

A Word From Verywell

If yous're sure that your claret pressure readings are correct and the blood pressure swings happen even when you're relaxed and well-rested, become run into a healthcare provider. With proper monitoring, healthy habits, and medications (if needed), you lot can gain command over your heart health.

Often Asked Questions

• How much can claret pressure level normally fluctuate?

  Normal variations may differ by person. However, large variations may betoken a health condition. One study looked at patients taking blood pressure medicine. They found variations of more 14 mm Hg in systolic pressure level were associated with a 25% increased gamble of middle failure.

• What are the symptoms of fluctuating blood pressure?

  You lot probably won't notice small-scale changes in blood pressure unless you bank check it. If y'all have large fluctuations, you lot may have facial flushing, sweating, headaches, or an uneasy feeling.

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Verywell Health uses simply high-quality sources, including peer-reviewed studies, to support the facts inside our manufactures. Read our editorial procedure to larn more near how we fact-cheque and keep our content accurate, reliable, and trustworthy.

1. Clark D, Nicholls SJ, St John J, et al. Visit-to-visit blood force per unit area variability, coronary atheroma progression, and clinical outcomes. JAMA Cardiol. 2019;4(five):437-443. doi:10.1001/jamacardio.2019.0751

2. American Centre Clan. Monitoring your blood force per unit area at home.

3. CMS.gov. Centers for Medicare & Medicaid Services. CMS expands coverage of ambulatory claret pressure level monitoring (ABPM).

4. Dietrich E, Desai R, Garg M, Park H, Smith SM. Reimbursement of ambulatory blood force per unit area monitoring in the US commercial insurance market place.J Clin Hypertens (Greenwich). 2020;22(one):6-15. doi:ten.1111/jch.13772

5. American Association of Endocrine Surgeons. Pheochromocytoma: Diagnosis and handling.

6. Cobos B, Haskard-Zolnierek G, Howard Grand. White coat hypertension: improving the patient-health care practitioner relationship. Psychol Res Behav Manag. 2015;viii:133-41. doi:10.2147/PRBM.S61192

7. Franklin SS, O'Brien E, Thijs L, Asayama G, Staessen JA. Masked hypertension: a miracle of measurement. Hypertension. 2015;65(ane):16-20. doi:ten.1161/HYPERTENSIONAHA.114.04522

8. American Eye Association. Know your run a risk factors for high blood pressure.

9. Muntner P, Whittle J, Lynch A, et al. Visit-to-visit variability of blood pressure level and coronary heart disease, stroke, middle failure, and mortality.Ann Intern Med. 2015;163(five):329-338. doi:x.7326/m14-2803

10. Cleveland Clinic. Does your blood pressure fluctuate widely? Here'southward why you lot need to pay close attention.

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