Many everyday activities, substances, and even clothing choices can temporarily raise the pressure inside your eyes. Normal eye pressure falls between 10 and 20 mmHg, and most temporary spikes resolve within minutes to hours. But understanding what triggers them matters, especially if you have glaucoma or are at risk for it. Each 1 mmHg increase in pressure fluctuation corresponds to roughly a 30% greater risk of vision field progression in people with glaucoma.
Heavy Lifting and Breath-Holding
Resistance exercise produces some of the most dramatic short-term pressure spikes measured in research. A study published in BMJ Open Ophthalmology found that eye pressure during weightlifting rose by an average of 26.5 mmHg, pushing the group’s mean pressure to 39.2 mmHg, well above the normal ceiling of 20. Isometric holds (think: planks or wall sits) caused the largest jumps, averaging 28.7 mmHg above baseline.
The culprit is the Valsalva maneuver, the instinct to hold your breath and bear down during a heavy rep. Exhaling forcefully against a closed airway raises pressure inside the chest, which backs up blood flow through the jugular veins, orbital veins, and the network of vessels feeding the eye. The blood vessels inside the eye engorge, and pressure climbs fast. The good news: pressure tends to drop back to baseline quickly once the exertion stops and breathing normalizes. Exhaling steadily during the effort, rather than holding your breath, can reduce the spike significantly.
Yoga Inversions
Going upside down redirects blood toward the head and eyes through gravity alone. Research published in Ophthalmology found that headstands produce a uniform twofold increase in eye pressure across all age groups, regardless of eye size or other anatomical differences. That means someone with a resting pressure of 15 mmHg could see it jump to around 30 during a headstand. If you practice yoga regularly and have concerns about eye pressure, shorter holds or modified poses that keep your head above your heart are a practical alternative.
Caffeine
A single cup of caffeinated coffee can nudge eye pressure upward, though the effect is modest compared to physical exertion. In a controlled study, eye pressure peaked about 15 minutes after drinking 250 ml of caffeinated coffee, remained elevated for roughly 45 minutes, and returned to baseline by the 60-minute mark. Decaffeinated coffee did not produce the same effect. For most people this small, brief rise is clinically insignificant, but for someone already managing elevated eye pressure, the cumulative effect of multiple cups a day could matter.
Drinking Large Volumes of Water Quickly
Downing a large amount of water in a short window stresses the eye’s fluid drainage system. Ophthalmologists have historically used a “water drinking test” for exactly this reason: it reveals how well the eye handles a sudden increase in fluid volume. In healthy eyes the drainage system compensates efficiently, but in eyes with compromised outflow (such as glaucomatous eyes), the pressure spike is more pronounced and takes longer to resolve.
Playing Wind and Brass Instruments
Sustained blowing against resistance mimics the Valsalva maneuver, and musicians who play brass or woodwind instruments experience measurable pressure spikes during practice and performance. Brass players are hit hardest. Playing a high-pitched note at maximum effort pushed average eye pressure from about 15 mmHg to over 23 mmHg, and 57% of brass musicians reached pressures in the ocular hypertension range during these efforts. One player hit 51 mmHg.
Woodwind players experience smaller but still significant increases. Oboe players, whose instrument demands high airway resistance, saw average pressures rise from 17 to 21 mmHg on high notes. Clarinet players showed a more modest increase, peaking around 19 mmHg. Even a 10-minute practice session produced statistically significant pressure elevation across the group. For professional musicians who play daily for hours, these repeated spikes are worth discussing with an eye care provider.
Steroid Medications
Corticosteroids, whether taken as eye drops, oral pills, or injections near the eye, can raise eye pressure over days to weeks. The timeline depends on how the steroid is delivered. Topical eye drops most commonly cause a rise between three and six weeks of use, though it can happen sooner. Oral steroids can elevate pressure within one to four weeks. Injections near or around the eye sometimes take a few months, though early cases have been documented within a week.
Not everyone responds this way. Roughly one in three people appears to be a “steroid responder,” meaning their eyes are particularly sensitive to corticosteroid-induced pressure changes. The effect is generally reversible once the medication is stopped or tapered, but prolonged, unmonitored steroid use can lead to lasting damage. If you’re prescribed steroids for any condition, periodic eye pressure checks are standard practice.
Cold Medicine and Allergy Drugs
Several common over-the-counter medications can trigger a pressure crisis in people with narrow drainage angles in their eyes. Antihistamines like diphenhydramine (Benadryl), loratadine (Claritin), fexofenadine (Allegra), and cetirizine (Zyrtec) all carry this risk. So do combination cold and flu products like DayQuil, NyQuil, and Alka-Seltzer Plus, which bundle antihistamines with decongestants.
These drugs have anticholinergic properties that can cause the pupil to dilate, which in susceptible eyes pushes the iris forward and blocks the drainage angle entirely. The risk increases when multiple medications with this effect are combined. For people with confirmed open angles or who have had a preventive laser procedure, the risk is much lower. But if you’ve been told you have narrow angles, check with your eye care provider before reaching for these common remedies. Sudden eye pain, nausea, foggy vision, or seeing halos around lights after taking any of these medications signals an emergency.
Tight Neckwear
A tight necktie or collar compresses the jugular veins in the neck, raising venous pressure in the head and, by extension, inside the eyes. The mechanism is the same chain reaction seen during heavy lifting: restricted venous return increases pressure in the blood vessels that drain the eye. Research in the British Journal of Ophthalmology confirmed this link and noted that the effect could be large enough to influence pressure readings during an eye exam, potentially leading to a misdiagnosis of elevated pressure if the tie isn’t loosened first.
Eye Injections
Intravitreal injections, commonly used to treat conditions like macular degeneration, cause an immediate and substantial pressure spike. A meta-analysis of 46 studies found that pressure rises by an average of 23.4 mmHg right after the injection, which can push readings into the 40s or higher. This happens simply because additional fluid volume has been added inside a closed space. Fortunately, the eye adjusts quickly. Pressure typically returns to baseline within about an hour, and the clinical team monitors you during that window before sending you home.
Your Body’s Natural Daily Cycle
Even without any external trigger, eye pressure fluctuates throughout the day. It tends to peak in the early morning, around 8:00 a.m., and drop to its lowest point in the early afternoon, around 2:30 p.m. In people with healthy eyes, this daily swing averages about 3 to 4 mmHg. In people with ocular hypertension, it can reach 4 to 5 mmHg or more.
This natural rhythm explains why a pressure reading taken at one time of day might differ from one taken at another. It also means that a single measurement may not capture the full picture. For people with glaucoma, pressure fluctuations of 3 mmHg or more have been linked to meaningful vision loss over time, and each unit increase in a patient’s standard deviation of pressure measurements has been associated with a 3.2 times higher rate of glaucoma progression over five or more years. Knowing your triggers and managing the modifiable ones can help keep those fluctuations in a safer range.