Many things can increase blood pressure, from what you eat and drink to how you sleep, what medications you take, and how your body handles stress. Some factors raise it temporarily by a few points, while others push it up persistently over months or years. Understanding which ones apply to you is the first step toward keeping your numbers in a healthy range, since sustained readings of 130/80 mm Hg or higher now qualify as Stage 1 hypertension under current guidelines.
Too Much Sodium, Too Little Potassium
Sodium and potassium work as a pair to regulate how much fluid your body holds in your bloodstream. When you take in too much sodium and not enough potassium, your body retains extra water, which increases the volume of blood your heart has to pump and raises pressure against your artery walls.
The average American consumes more than 3,400 mg of sodium per day, well above the recommended ceiling of 2,300 mg. Most of that sodium comes not from the salt shaker but from processed and restaurant foods: bread, deli meats, canned soups, pizza, and packaged snacks. Increasing your potassium intake (through bananas, potatoes, beans, and leafy greens) helps counterbalance sodium’s effect by encouraging your kidneys to flush out excess fluid.
Added Sugar and Fructose
Sodium gets most of the attention, but high sugar intake also contributes to rising blood pressure through a less obvious pathway. When your body breaks down fructose (the sugar found in sweetened drinks, candy, and many processed foods), the process generates uric acid as a byproduct. Elevated uric acid interferes with nitric oxide, a molecule your blood vessels depend on to stay relaxed and flexible. Without enough nitric oxide, vessels stiffen, resistance to blood flow increases, and pressure climbs. High uric acid levels have been linked to increased resistance in both the kidney’s blood vessels and the wider circulatory system.
Alcohol, Even in Moderate Amounts
A large meta-analysis published in the AHA’s Hypertension journal found that the relationship between alcohol and systolic blood pressure is direct and linear, with no safe threshold. Drinking just 12 grams of alcohol per day (roughly one standard drink) was associated with systolic pressure 1.25 mm Hg higher than nondrinkers. That may sound small, but across a whole population it translates into a meaningful increase in cardiovascular events.
The effect scales up predictably. Two drinks a day corresponded to systolic pressure about 2.5 mm Hg higher, and four drinks a day pushed it nearly 5 mm Hg higher. Cutting back on alcohol is one of the more straightforward ways to lower your numbers without medication.
Caffeine
Caffeine causes a short-term spike in blood pressure by stimulating your nervous system and temporarily tightening blood vessels. In studies where participants avoided coffee for at least 12 hours, then consumed the equivalent of three to four cups, both systolic and diastolic pressure rose by about 6/5 mm Hg. For most people, this effect is temporary. But if you’re already running high, those extra points can push you into a concerning range, especially right before a blood pressure reading at your doctor’s office.
Chronic Stress and Cortisol
When you’re under stress, your body releases cortisol and activates the sympathetic nervous system, the “fight or flight” response that raises your heart rate and constricts blood vessels. In short bursts, this is harmless. When stress is constant, though, the effects accumulate.
Cortisol raises blood pressure partly by interfering with nitric oxide, the same relaxation signal that uric acid disrupts. It inhibits the enzymes that produce nitric oxide and blocks the transport of the raw materials your body needs to make it. Cortisol also stimulates production of erythropoietin, a hormone that has direct vessel-constricting effects. People with conditions that cause chronically elevated cortisol (like Cushing syndrome) almost always develop high blood pressure, illustrating how powerful this hormone’s effect can be.
Sleep Apnea
Obstructive sleep apnea is the single most common medical condition behind secondary hypertension, the type caused by an identifiable underlying problem. An estimated 50% of people with high blood pressure also have sleep apnea, though many don’t know it.
During sleep apnea episodes, your airway collapses repeatedly, causing oxygen levels to drop and carbon dioxide to build up. Each time, your nervous system surges into overdrive to restart breathing. These surges flood your bloodstream with stress hormones called catecholamines. Unlike a single stressful event, these episodes happen dozens or hundreds of times per night, and the elevated sympathetic activity persists into the daytime even when you’re breathing normally. If your blood pressure stays stubbornly high despite lifestyle changes, undiagnosed sleep apnea is one of the first things worth investigating.
Common Medications That Raise Pressure
Several over-the-counter and prescription medications can increase blood pressure, sometimes enough to push someone from a normal range into hypertension.
- Pain relievers (NSAIDs): Ibuprofen (Advil, Motrin) and naproxen (Aleve) cause your body to retain water, which increases blood volume and puts extra strain on the kidneys. If you take these regularly for joint pain or headaches, they could be quietly raising your readings.
- Decongestants: Pseudoephedrine and phenylephrine, found in many cold and allergy products, work by narrowing blood vessels to reduce nasal swelling. That same narrowing effect raises pressure throughout your body.
- Hormonal birth control: Birth control pills and patches contain hormones that can raise blood pressure in some people. The risk is higher if you’re over 35, overweight, or smoke.
If you take any of these regularly and your blood pressure has crept up, it’s worth considering whether the medication is a contributing factor.
Medical Conditions Behind High Readings
Sometimes high blood pressure isn’t a condition on its own but a symptom of something else. This is called secondary hypertension, and treating the underlying cause can often bring pressure back to normal. The most common culprits, ranked roughly by frequency:
- Obstructive sleep apnea
- Narrowed kidney arteries (renal artery stenosis): When blood flow to the kidneys is restricted, they respond by releasing hormones that raise pressure throughout the body.
- Excess aldosterone production (Conn’s syndrome): The adrenal glands produce too much of a hormone that causes salt and water retention.
- Kidney disease: Damaged kidneys can’t filter fluid efficiently, leading to volume overload.
- Adrenal tumors: Rare tumors called pheochromocytomas release bursts of adrenaline that cause dramatic pressure spikes.
- Thyroid disorders: Both an underactive and overactive thyroid can raise blood pressure through different mechanisms.
Secondary hypertension is worth considering if your blood pressure rises suddenly, doesn’t respond well to standard treatments, or develops before age 30. It accounts for a meaningful minority of all hypertension cases, and identifying it changes the treatment approach entirely.
Where the Thresholds Stand
The 2025 guidelines from the American Heart Association and American College of Cardiology define blood pressure in four tiers. Normal is below 120/80 mm Hg. Elevated is 120 to 129 systolic with diastolic still under 80. Stage 1 hypertension starts at 130/80, and Stage 2 begins at 140/90 or higher. If your systolic and diastolic numbers fall into different categories, the higher category applies.
These thresholds matter because many of the factors above don’t act alone. A few extra milligrams of sodium, a couple of drinks, regular ibuprofen use, and poor sleep can each nudge your pressure up by a small amount. Stacked together, they can push someone from a comfortable range into Stage 1 hypertension without any single dramatic cause.