Many things can raise your blood pressure, from the food you eat to medications you might not suspect. Normal blood pressure sits below 120/80 mmHg, while readings of 130/80 or higher now qualify as hypertension under the latest AHA/ACC guidelines. Some causes are temporary, like a cup of coffee before a reading, while others build over months or years through changes in how your arteries, kidneys, and nervous system regulate pressure.
Too Much Sodium
Sodium is one of the most well-established drivers of high blood pressure. When you eat too much salt, your body holds onto extra water to dilute it, which increases the volume of fluid your heart has to pump. But the effect goes deeper than fluid retention alone. Excess sodium triggers your brain to ramp up nerve signals that constrict blood vessels. It also stimulates your adrenal glands to release a hormone that makes artery walls tighten by pushing calcium into smooth muscle cells, causing them to squeeze harder. Over time, this sustained constriction damages the lining of blood vessels and reduces their ability to relax, making the pressure increase self-reinforcing.
Potassium works in the opposite direction. Increasing your potassium intake helps lower blood pressure by counteracting sodium’s effects on fluid balance and vessel tone. Most people eat far more sodium and far less potassium than their bodies are designed to handle, and correcting that imbalance is one of the most effective dietary changes you can make.
Excess Body Weight
Carrying extra weight raises blood pressure through a mechanism that goes well beyond simply making the heart work harder. Fat tissue, particularly around the abdomen, actively produces hormones and signaling molecules that constrict blood vessels. In people with obesity, fat cells manufacture components of the same hormonal system (the renin-angiotensin-aldosterone system) that your kidneys use to regulate pressure. This means your body is essentially running two pressure-raising systems instead of one.
The result is higher levels of angiotensin II, a powerful vasoconstrictor that also reduces the availability of nitric oxide, the molecule your blood vessels depend on to relax and widen. Fat tissue can even produce aldosterone directly, a hormone that tells your kidneys to retain sodium and water. This creates a cycle: more body fat produces more pressure-raising hormones, which makes the cardiovascular system work harder, which causes further damage over time.
Alcohol
There is no safe threshold for alcohol’s effect on blood pressure. A large meta-analysis published in the AHA journal Hypertension found a linear relationship between alcohol consumption and rising blood pressure, meaning any amount pushes readings upward. Even a single standard drink per day (about 12 grams of alcohol) was associated with systolic blood pressure roughly 1.25 mmHg higher than nondrinkers. At four drinks per day, the difference climbed to nearly 5 mmHg for systolic pressure and about 3 mmHg for diastolic.
The effect was strongest and most consistent in men. In women, the systolic increase was smaller and less statistically certain at low intake levels, though diastolic pressure still rose. These numbers may sound modest, but at a population level, even a few mmHg of sustained increase meaningfully raises the risk of stroke and heart disease.
Chronic Stress and Cortisol
Short bursts of stress temporarily spike blood pressure through the fight-or-flight response, and that’s normal. The concern is chronic stress, which keeps cortisol levels elevated for weeks or months. Cortisol raises blood pressure by directly interfering with nitric oxide, the chemical signal that tells your arteries to relax. Research from the AHA shows that cortisol suppresses the enzymes that produce nitric oxide and blocks the transport of the raw materials needed to make it. After just five days of elevated cortisol in study participants, the ability of blood vessels to dilate in response to normal signals was measurably impaired.
Cortisol also stimulates the production of erythropoietin, a hormone that increases red blood cell production. More red blood cells thicken the blood, which requires more force to push through the same vessels. In studies, the rise in erythropoietin correlated directly with the rise in systolic blood pressure.
Sleep Apnea
Obstructive sleep apnea is one of the most common and underdiagnosed causes of high blood pressure. When your airway collapses repeatedly during sleep, oxygen levels drop and carbon dioxide builds up. Your nervous system responds with surges of adrenaline-like chemicals that constrict blood vessels and raise heart rate. These surges happen dozens or even hundreds of times per night in severe cases.
What makes sleep apnea particularly damaging is that the nervous system changes don’t reset during the day. The elevated sympathetic nerve activity and higher levels of stress hormones persist into waking hours, keeping blood pressure elevated around the clock. If your blood pressure is high despite medication and lifestyle changes, untreated sleep apnea is one of the first things worth investigating.
Menopause and Hormonal Shifts
Blood pressure tends to rise in women after menopause, and the mechanism is hormonal rather than simply age-related. Estrogen helps blood vessels produce nitric oxide and stay flexible. When estrogen levels drop, the balance shifts toward more vasoconstrictors like endothelin and angiotensin II, and less of the dilating signals that keep arteries relaxed. Research in more than 300 women found that postmenopausal women had measurably stiffer arteries, with higher pulse wave velocity and larger carotid artery diameters, both markers of reduced vascular elasticity.
The estrogen decline also increases sensitivity to salt. Postmenopausal women are more likely to see blood pressure spikes from sodium intake that wouldn’t have affected them earlier. Sympathetic nervous system activity also increases after menopause, adding another layer of vascular constriction. Studies show that estrogen therapy can restore nitric oxide activity to premenopausal levels, which helps explain why the transition itself is a turning point for cardiovascular risk.
Kidney Problems
Your kidneys are central to blood pressure regulation. They control how much sodium and water your body retains, and they produce renin, the enzyme that kicks off the hormonal cascade controlling vessel constriction. When blood flow to the kidneys is reduced, as happens with renal artery stenosis (a narrowing of the arteries feeding the kidneys), the affected kidney interprets the low flow as a sign that blood pressure is too low and activates the renin-angiotensin-aldosterone system to raise it.
In cases where both kidney arteries are narrowed, or when a single functioning kidney has reduced blood flow, the problem compounds. Not only do vasoconstrictor levels rise, but the kidneys also lose their ability to properly excrete sodium, leading to fluid buildup on top of arterial constriction. This type of blood pressure elevation is often resistant to standard treatments until the underlying circulation problem is addressed.
Medications and Supplements
Several common over-the-counter and prescription medications can raise blood pressure, sometimes significantly. Pain relievers like ibuprofen and naproxen are among the most frequent culprits. They work by blocking inflammation, but in doing so they also cause the body to retain sodium and water and reduce blood flow to the kidneys.
Other medications and substances that can raise blood pressure include:
- Decongestants containing pseudoephedrine or phenylephrine, found in many cold and sinus products
- Hormonal birth control, which can raise blood pressure in some people
- Antidepressants, including SSRIs, tricyclics, and MAO inhibitors
- ADHD stimulants like methylphenidate
- Caffeine, particularly in people who don’t consume it regularly
- Immunosuppressants such as cyclosporine and tacrolimus
- Herbal supplements including licorice root, ginseng, ephedra, and guarana
Recreational drugs also raise blood pressure acutely and sometimes dangerously. Cocaine, amphetamines, and MDMA all cause intense vasoconstriction and spikes in heart rate. If you’re monitoring your blood pressure and it seems unexpectedly high, reviewing everything you take, including supplements and over-the-counter products, is a practical first step.
Physical Inactivity
A sedentary lifestyle raises blood pressure by multiple paths. Without regular exercise, your heart doesn’t develop the efficiency to pump blood with less effort per beat. Resting heart rate stays higher, arterial walls become stiffer, and insulin resistance develops more easily, all of which push readings upward. Regular aerobic activity, even moderate walking, improves the ability of blood vessels to dilate and helps the kidneys excrete sodium more effectively. The blood pressure benefit of consistent exercise is comparable to the effect of some medications, typically a reduction of 5 to 8 mmHg in people with hypertension.
Genetics and Family History
Blood pressure has a strong hereditary component. If one or both of your parents had hypertension, your risk is substantially higher. Genetic factors influence how your kidneys handle sodium, how sensitive your blood vessels are to constricting signals, and how efficiently your body produces nitric oxide. None of this means high blood pressure is inevitable if it runs in your family, but it does mean the lifestyle factors listed above carry more weight for you than for someone without that genetic predisposition. The same amount of sodium, alcohol, or excess weight will likely produce a larger blood pressure effect in someone with a family history of hypertension.