Many things can raise blood pressure, from the food you eat to conditions you may not know you have. Blood pressure is considered high starting at 130/80 mm Hg (Stage 1 hypertension), and Stage 2 begins at 140/90 mm Hg. Most cases develop gradually from a combination of lifestyle, aging, and genetics, but specific medical conditions, medications, and even chronic stress can push your numbers up too.
Too Much Sodium, Too Little Potassium
The balance between sodium and potassium in your body has a direct effect on blood pressure. When you eat a lot of sodium, your kidneys hold onto more water to dilute it. That extra fluid increases the volume of blood your heart has to pump, which raises pressure against your artery walls. Processed and packaged foods are the biggest source of excess sodium for most people.
Potassium works in the opposite direction. It helps your kidneys flush sodium out and relaxes blood vessel walls. The World Health Organization recommends at least 3,510 mg of potassium per day, but diets heavy in processed food and light on fruits and vegetables often fall short. Increasing your potassium intake through foods like bananas, potatoes, beans, and leafy greens has been shown to significantly reduce blood pressure.
How Alcohol Raises Blood Pressure
Alcohol consumption has a dose-dependent relationship with hypertension, meaning the more you drink, the higher your risk climbs. A large meta-analysis of cohort studies found that the risk of hypertension increases notably above about 12 grams of alcohol per day, which is roughly one standard drink. In men and White populations, the risk curve steepened sharply above 24 grams per day (about two drinks). In women, that steep increase began at just 12 grams per day. If your blood pressure is already borderline, even moderate drinking can tip it higher.
Excess Weight and Physical Inactivity
Carrying extra weight forces your heart to work harder to supply blood to all that tissue. It also increases the activity of your body’s salt-retaining hormonal system, which raises fluid volume and constricts blood vessels. Visceral fat, the kind stored around your organs, is especially problematic because it promotes inflammation and hormonal changes that stiffen arteries.
Regular physical activity counters several of these effects. It improves how well your blood vessels expand and contract, lowers resting heart rate, and helps with weight management. Sedentary habits do the opposite, allowing blood vessels to lose their flexibility over time.
Chronic Stress and Your Nervous System
When you’re stressed, your body releases adrenaline and cortisol. These hormones temporarily raise blood pressure by speeding up your heart and tightening blood vessels. That’s a normal, short-term response. The problem comes when stress is constant. Persistent surges of adrenaline can physically damage blood vessel walls over time, promoting the buildup of artery-clogging deposits and keeping blood pressure elevated even during calm moments. Chronic stress also contributes to brain changes linked to anxiety and depression, which can reinforce the cycle.
Sleep Apnea
Obstructive sleep apnea is one of the most common and underdiagnosed causes of high blood pressure. When your airway repeatedly collapses during sleep, oxygen levels drop and carbon dioxide builds up. Your body responds with a burst of nervous system activity to jolt you awake so you can breathe again. Each episode sends a surge of stress hormones through your system and constricts blood vessels.
These effects don’t just disappear when you wake up. The repeated overnight episodes leave your nervous system in a heightened state during the day, with elevated blood vessel constriction even during waking hours. Over the longer term, the persistent nervous system overdrive also targets the kidneys, increasing salt retention and raising the resistance in kidney blood vessels. If your blood pressure is hard to control despite medication, undiagnosed sleep apnea is one of the first things worth investigating.
Kidney and Hormonal Conditions
Your kidneys are central to blood pressure regulation. They control how much sodium and water your body retains, and they produce hormones that tighten or relax blood vessels. Several kidney problems can disrupt this balance:
- Narrowed kidney arteries: Fatty plaque buildup or a structural condition called fibromuscular dysplasia can restrict blood flow to one or both kidneys. The kidneys respond as if the whole body’s blood pressure is too low and activate hormones that raise it.
- Diabetic kidney damage: Diabetes can harm the kidneys’ filtering system, leading to fluid retention and higher pressure.
- Polycystic kidney disease: Inherited cysts interfere with kidney function and raise blood pressure.
- Chronic kidney disease: Damaged kidneys also promote calcification of large artery walls, making them stiffer and less able to absorb the force of each heartbeat.
Hormonal conditions are another important category. The adrenal glands sit on top of your kidneys and produce hormones that directly affect blood pressure. When they overproduce aldosterone, your kidneys retain too much salt and water. Cushing syndrome, where the body makes excess cortisol (either from a tumor or from corticosteroid medications), also drives blood pressure up. A rare adrenal tumor called a pheochromocytoma floods the body with adrenaline, causing dramatic blood pressure spikes. Overactive parathyroid glands raise calcium levels in the blood, which in turn raises blood pressure.
Medications That Push Pressure Up
Several common over-the-counter medications can raise your blood pressure, sometimes significantly. NSAIDs like ibuprofen and naproxen cause the body to retain water, which increases blood volume and puts extra strain on the kidneys. Decongestants found in cold and sinus medications narrow blood vessels throughout the body, not just in your nose. That constriction directly raises pressure. If you take these occasionally, the effect is temporary. But regular use, especially if you already have high blood pressure, can make a meaningful difference in your readings.
How Aging Stiffens Your Arteries
Blood pressure tends to rise with age, and the primary reason is structural changes in your arteries. Healthy arteries are elastic. They stretch when your heart pumps and spring back between beats, which keeps pressure relatively even. Over decades, the elastic fibers in artery walls break down and are replaced by stiffer collagen. Cross-links form between collagen fibers, making the walls even more rigid. Inflammation, oxidative stress, and calcification accelerate the process.
This stiffening is why older adults often develop isolated systolic hypertension, where the top number is high but the bottom number stays normal or even drops. The stiff arteries can’t absorb the force of each heartbeat, so peak pressure rises. Chronic conditions speed up this timeline. High blood sugar promotes the formation of advanced glycation end products, a type of molecular “glue” that cross-links collagen and stiffens arteries faster. Chronic kidney disease adds calcification to artery walls. This is why people with diabetes or kidney disease often develop high blood pressure earlier and more severely.
The Hormonal System That Ties It All Together
Many of these causes converge on a single hormonal pathway. Your kidneys release an enzyme called renin when they sense low blood flow or low sodium. Renin triggers a chain reaction that ultimately produces a powerful hormone that constricts blood vessels and tells your adrenal glands to release aldosterone, which makes your kidneys retain sodium and water. The net effect is higher blood pressure.
In a healthy body, this system activates when needed and then quiets down. But in many forms of hypertension, it stays chronically overactive. The vessel-constricting hormone doesn’t just tighten arteries temporarily. Over time, it causes inflammation, promotes the growth of muscle cells in artery walls, generates damaging free radicals, and triggers structural remodeling that makes vessels permanently thicker and stiffer. Aldosterone compounds the problem: when combined with a high-salt diet, it stiffens the inner lining of blood vessels and reduces their ability to produce nitric oxide, a molecule that normally keeps vessels relaxed. This is why salt sensitivity and hormonal imbalances are so closely linked, and why treating one without addressing the other often falls short.
Genetics and Family History
If high blood pressure runs in your family, your risk is higher regardless of lifestyle. Genetic factors influence how your kidneys handle sodium, how your blood vessels respond to hormonal signals, and how quickly your arteries stiffen with age. Some inherited conditions, like polycystic kidney disease or certain forms of kidney artery narrowing, directly cause hypertension. But even without a specific condition, having a parent with high blood pressure roughly doubles your own risk. Genetics don’t guarantee you’ll develop hypertension, but they do lower the threshold at which other factors (salt intake, weight gain, stress, alcohol) start to matter.