A blood pressure of 140/90 mmHg or higher is considered high blood pressure (hypertension), specifically Stage 2 hypertension, indicating a need for medical attention and likely lifestyle changes, potentially medication, to reduce risks of heart disease and stroke, though a single reading isn't a diagnosis; it requires consistent elevation to be confirmed.
Your blood pressure is considered high (stage 1) if it reads 130 to 139 mmHg/80 to 89 mmHg. Stage 2 high blood pressure is 140/90 or higher. If you get a blood pressure reading of 180/120 or higher more than once, seek medical treatment right away. A reading this high is considered “hypertensive crisis.”
Hypertension increases the pressure on blood vessels in your head and neck, which can trigger severe headaches. In particular, a hypertensive headache may feel similar to a dull, pressing sensation on both sides of the head. The pain can extend from the back of the head and neck to the front.
Alarming blood pressure in pregnancy is generally 140/90 mmHg or higher, with readings of 160/110 mmHg or above considered severe and a medical emergency, especially when accompanied by symptoms like severe headaches, vision changes, or upper abdominal pain, indicating serious conditions like preeclampsia or HELLP syndrome, requiring immediate medical attention.
The body releases a surge of hormones when under stress. These hormones cause the heart to beat faster and the blood vessels to narrow. These actions increase blood pressure for a time. There's no proof that stress by itself causes long-term high blood pressure.
Other signs and symptoms may include:
If your blood pressure reading is 140/90 mmHg or higher and you have protein in your urine, you will be diagnosed with preeclampsia. The condition is considered to be severe if your blood pressure is 160/110 mmHg or higher or if you have other symptoms or abnormal blood work.
Common causes of high blood pressure spikes
Stage 1 hypertension.
The top number is between 130 and 139 mm-Hg or the bottom number is between 80 and 89 mm-Hg.
The less you sleep, the higher your blood pressure may go. People who sleep six hours or less may have steeper increases in blood pressure. If you already have high blood pressure, not sleeping well may make your blood pressure worse.
At the beginning, measure your blood pressure at least twice daily. Take it first in the morning before eating or taking any medicine. Take it again in the evening. Each time you measure, take two or three readings to make sure your results are the same.
If your blood pressure is higher than 180 and/or 120 mm Hg and you have any of these symptoms, call 911: chest pain, shortness of breath, back pain, numbness, weakness, change in vision or difficulty speaking.
You should go to the ER for high blood pressure when it's also causing symptoms. Examples include headaches, vision changes, confusion, chest pain, trouble breathing, and nausea. You're more likely to have symptoms with high blood pressure when the reading goes over 180/120 mmHg.
Wrist and finger monitors are not recommended. They give less reliable readings. Choose a monitor that has been validated. If you are unsure, ask your health care professional or pharmacist for advice or find options at validatebp.org(link opens in new window).
How does caffeine affect blood pressure? Caffeine may cause a brief rise in your blood pressure, even if you don't have high blood pressure. This short-term spike in blood pressure happens mainly in people who don't drink caffeine often, rather than in those who do.
Acute meal ingestion, caffeine or nicotine use can all affect BP readings, leading to errors in measurement accuracy. If the patient has a full bladder, that can lead to an error in systolic BP of up to 33 mm Hg, and the white-coat effect can have an error of up to 26 mm Hg.
Kidney disease, diabetes and sleep apnea are some of the conditions that can lead to high blood pressure. Pregnancy. Sometimes pregnancy causes high blood pressure.
High blood pressure typically develops gradually over years. Primary hypertension, the most common type, has no identifiable cause but results from a combination of genetic factors and lifestyle choices. Secondary hypertension stems from underlying conditions like kidney disease, sleep apnea, or certain medications.
For many years pre eclampsia has been considered to be a two-stage disease. The first stage comprises poor placentation. The second stage is the clinical expression of the disease namely new hypertension and new proteinuria.
After 20 weeks of pregnancy, blood pressure that's higher than 140/90 mm Hg without any other organ damage is considered to be gestational hypertension. Blood pressure needs to be taken and documented on two or more occasions, at least four hours apart.
Along with high blood pressure, preeclampsia signs and symptoms may include:
Trouble speaking or understanding. Problems with vision, such as dimness or loss of vision in one or both eyes. Dizziness or problems with balance or coordination. Problems with movement or walking.
Even without obvious symptoms, silent strokes raise the risk of future strokes and can lead to cognitive decline or vascular dementia. Key warning signs include sudden mood changes, memory issues, balance problems, and cognitive difficulties — but only MRI or CT scans can confirm a silent stroke.
The FAST acronym (Face, Arms, Speech, Time) is a test to quickly identify the three most common signs of stroke.