Long-term use of nonsteroidal anti-inflammatory drugs carries a well-documented set of risks that extend far beyond the upset stomach most people associate with popping ibuprofen or naproxen. These medications can damage the lining of the gut from top to bottom, raise blood pressure, harm the kidneys, strain the liver, interfere with bone healing, and worsen cardiovascular disease. Most of these harms scale with dose and duration, which makes the casual, years-long use that many people fall into particularly concerning.
What Happens Inside the Gut
The gastrointestinal tract is the organ system most visibly affected by chronic NSAID use. NSAIDs work by blocking enzymes that produce prostaglandins, and some of those prostaglandins are responsible for maintaining the protective mucus lining of the stomach and intestines. Without that shield, stomach acid eats into the tissue. The result ranges from mild dyspepsia and heartburn all the way to peptic ulcers, bleeding, and perforation.1PubMed Central. Non-steroidal anti-inflammatory drugs and the gastrointestinal tract Everyone who has read an ibuprofen bottle knows about stomach irritation, but what surprises many people is how much damage happens further down the digestive tract.
Studies using capsule endoscopy have revealed that more than half of patients on NSAIDs show mucosal damage in the small intestine, a region that standard upper endoscopy cannot reach.2PubMed. Present status and strategy of NSAIDs-induced small bowel injury This small-bowel injury is usually silent, producing no symptoms at all, but it can occasionally cause serious complications like strictures, heavy bleeding, or perforation.3PubMed Central. Prevention and management of non-steroidal anti-inflammatory drugs-induced small intestinal injury Because this damage is hard to detect without specialized imaging, it often goes unrecognized until a complication forces attention.
There is also a newer line of research linking NSAIDs to changes in the gut microbiome. NSAIDs can shift the balance of bacteria in the intestines, reducing beneficial species and allowing less helpful ones to flourish.4PubMed Central. NSAID-Gut Microbiota Interactions One study found that the NSAID mefenamic acid specifically depleted butyrate-producing bacteria, which are important for gut-lining health, and increased the abundance of potentially harmful species.5Chemical Research in Toxicology. Nonsteroidal Anti-Inflammatory Drug Mefenamic Acid Induces Dysbiosis by Depleting Butyrogenic Gut Commensals Researchers suspect this dysbiosis may itself contribute to the gut damage seen with long-term use, creating a feedback loop on top of the direct chemical irritation.
Cardiovascular and Blood Pressure Risks
The cardiovascular risks of NSAIDs gained public attention in 2004 when rofecoxib (Vioxx) was pulled from the market over heart attack concerns. The problem is not limited to that one drug. Both older, nonselective NSAIDs and the newer COX-2-selective drugs have been linked to increased risk of heart attacks and strokes, though the size of the risk varies considerably depending on the specific drug and dose.6PubMed Central. Risk of stroke associated with nonsteroidal anti-inflammatory drugs
The evidence is not uniform across all NSAIDs. Long-term data suggest that rofecoxib and diclofenac carry the clearest signal for heart attacks and strokes, while the picture for other NSAIDs is less definitive.7PubMed. Cardiovascular events associated with the long-term use of NSAIDs: a review of randomized controlled trials and observational studies A large observational study found that among people without pre-existing cardiovascular disease, rofecoxib, valdecoxib, and indomethacin were each associated with meaningfully higher rates of cardiovascular events compared to non-use, while celecoxib was not. Among patients who already had heart disease, naproxen was the only NSAID linked to a lower event rate.8PubMed. Non-aspirin NSAIDs, cyclooxygenase-2 inhibitors and risk for cardiovascular events-stroke, acute myocardial infarction, and death from coronary heart disease This is why you sometimes hear that naproxen is the “heart-friendliest” NSAID, though even that comes with other trade-offs.
Beyond major events, NSAIDs can quietly nudge blood pressure upward. Two meta-analyses found that NSAIDs cause small but real elevations in systolic blood pressure, generally under 5 mmHg, with minimal change in diastolic pressure.9PubMed. Effects of nonsteroidal anti-inflammatory drug therapy on blood pressure and peripheral edema That sounds minor, but for someone already on blood pressure medication and hovering near a controlled target, even a few points of increase can matter. NSAIDs can also cause fluid retention and peripheral edema, which compounds the problem for people with heart failure.
How NSAIDs Affect the Kidneys
Your kidneys rely on prostaglandins to help maintain healthy blood flow, especially when you are dehydrated, elderly, or already dealing with reduced kidney function. NSAIDs suppress those prostaglandins, which can reduce blood flow to the kidneys and trigger acute kidney injury. This is the most immediate renal concern with NSAID use and is more likely in people who are volume-depleted or taking other medications that stress the kidneys.
The longer-term kidney picture involves a different mechanism. Chronic NSAID use has been associated with a condition called tubulointerstitial nephritis, where inflammation damages the tissue between the kidney’s filtering units. This process may involve damage to the filtering membrane itself and changes in the structures that hold it together.10PubMed Central. Kidney damage from nonsteroidal anti-inflammatory drugs-Myth or truth? Review of selected literature The two main enzyme targets of NSAIDs, COX-1 and COX-2, appear to play opposing roles in the kidney: blocking one tends to lower blood pressure and promote sodium loss, while blocking the other raises blood pressure and promotes sodium retention. This tug-of-war means that different NSAIDs can have different kidney profiles depending on which enzyme they prefer to inhibit.
Liver Injury
Compared to the gut and kidneys, liver damage from NSAIDs is less common but can be serious. The spectrum runs from temporary, symptom-free elevations in liver enzymes all the way to full-blown liver failure in rare cases.11PubMed Central. Non-steroidal anti-inflammatory drugs: What is the actual risk of liver damage? The challenge in pinning down the true risk is that mild cases tend to be underreported, and many studies have not followed rigorous pharmacovigilance criteria.
Among individual drugs, a systematic review of randomized trials found that diclofenac consistently stood out as having the highest proportion of clinically significant liver toxicity events, followed by celecoxib and etoricoxib at much lower rates.12PubMed Central. Hepatotoxicity of Nonsteroidal Anti-Inflammatory Drugs: A Systematic Review of Randomized Controlled Trials Diclofenac’s liver risk is well enough established that periodic liver-function monitoring is sometimes recommended during long-term use, particularly in the first few months of therapy.
Effects on Bone Healing
If you have ever broken a bone, there is a reasonable chance someone handed you an NSAID for the pain. Ironically, the inflammation NSAIDs suppress is part of the body’s normal bone-repair process, and there is growing evidence that long-term NSAID use after a fracture can interfere with healing. A meta-analysis of randomized controlled trials found that the risk of nonunion was substantially higher in patients who took NSAIDs after a fracture. The key variable was duration: patients who used NSAIDs for a short period, less than two weeks, showed no significant increase in nonunion risk, while those who took them for more than four weeks did. The drug indomethacin was particularly problematic.13PubMed Central. The effect of NSAIDs on postfracture bone healing: a meta-analysis of randomized controlled trials
A separate systematic review and meta-analysis found that, among adults, NSAID use roughly doubled the odds of adverse bone-healing events. The same association did not hold in children, where NSAID use showed no significant increase in healing problems.14SurgiColl. The Association of NSAID Use and Risk of Adverse Fracture Healing: A Systematic Review and Meta-analysis For adults recovering from a fracture, the practical takeaway is straightforward: a few days of NSAID pain relief after an injury is probably fine, but prolonged use deserves a conversation with your doctor about alternatives.
Medication Overuse Headache
People who take NSAIDs frequently for migraines or tension headaches can find themselves trapped in a vicious cycle. Medication overuse headache develops when acute pain medications are used on fifteen or more days per month for three months or longer, turning episodic headaches into a near-daily condition.15PubMed Central. Medication overuse headache: a review of current evidence and management strategies The brain essentially adapts to expect the medication, and each dose wears off into a rebound headache that prompts another dose.
NSAIDs are not the worst offenders here; opioids, triptans, and combination analgesics tend to cause overuse headache more readily. But NSAIDs are widely available without a prescription, which makes it easy to drift into a pattern of daily use without realizing the headaches are now being caused, rather than cured, by the pills.16PubMed. Medication overuse headache: history, features, prevention and management strategies The standard treatment involves withdrawing the overused medication, which typically makes headaches worse for a few weeks before they improve.
Who Faces the Highest Risk
Not everyone who takes NSAIDs long-term faces the same level of danger. Certain groups are far more vulnerable, and the risks compound in predictable ways.
Older Adults
Older people occupy the unfortunate intersection of needing NSAIDs more (chronic joint pain, osteoarthritis) and being more susceptible to their harms. Baseline risks for cardiovascular events, GI bleeding, and impaired kidney function all increase with age, and NSAIDs push each of those risks higher.17British Journal of General Practice. The dangers of NSAIDs: look both ways Chronic NSAID use in older adults has been linked to increased rates of peptic ulcer disease, acute kidney failure, and stroke or heart attack, and it can worsen conditions like heart failure and hypertension.18PubMed Central. Recognizing the Risks of Chronic Nonsteroidal Anti-Inflammatory Drug Use in Older Adults Adding to the problem, older adults are more likely to be on other medications that interact badly with NSAIDs, such as blood thinners and corticosteroids.19PubMed Central. A Comprehensive Review of Non-Steroidal Anti-Inflammatory Drug Use in The Elderly
Pregnant Women
NSAIDs during pregnancy pose a distinct set of fetal risks. Because prostaglandins help regulate blood flow through the fetal ductus arteriosus (a vessel that bypasses the lungs before birth), NSAID use can cause premature constriction of that vessel. Fetal kidney function can also be impaired, leading to reduced amniotic fluid levels.20PubMed. Use of non-steroidal anti-inflammatory drugs in pregnancy and oligohydramnios: a review On the maternal side, NSAIDs can prolong pregnancy and labor.21PubMed. Nonsteroidal anti-inflammatory drugs during pregnancy Short-term therapeutic use under close medical supervision can sometimes be appropriate, but the effects appear to be reversible only when the drugs are stopped promptly.22PubMed. A double-blind randomized study of fetal side effects during and after the short-term maternal administration of indomethacin, sulindac, and nimesulide for the treatment of preterm labor The general advice is to avoid NSAIDs after about 20 weeks of gestation, and especially in the third trimester.
People on SSRIs or Blood Thinners
If you take a selective serotonin reuptake inhibitor for depression or anxiety, adding a daily NSAID significantly raises your risk of upper GI bleeding.23PubMed Central. Selective Serotonin Reuptake Inhibitors and Associated Bleeding Risks: A Narrative and Clinical Review SSRIs affect platelets by depleting their serotonin stores, and when that antiplatelet effect is combined with NSAIDs’ own interference with clotting and their direct irritation of the gut lining, the bleeding risk multiplies.24PubMed. Clinical impact of selective serotonin reuptake inhibitors therapy with bleeding risks The same principle applies, often more dramatically, when NSAIDs are combined with anticoagulants like warfarin.
NSAID-Exacerbated Respiratory Disease
A subset of people with asthma and chronic sinus disease with nasal polyps experience a dramatic worsening of their respiratory symptoms when they take NSAIDs. This condition, called NSAID-exacerbated respiratory disease, involves intense inflammation driven by overproduction of certain inflammatory molecules called cysteinyl leukotrienes.25PubMed. Diagnosis and management of NSAID-Exacerbated Respiratory Disease (N-ERD)-a EAACI position paper A person with this condition who takes aspirin or ibuprofen can experience severe asthma attacks, nasal congestion, and flushing within minutes to hours.
What makes this condition tricky is that it can develop in adulthood in someone who previously tolerated NSAIDs without any problem. Some patients also experience symptoms beyond the airways, including coronary artery spasm, GI upset, and skin rashes triggered by the same mechanism.26PubMed. Critical pathomechanisms of NSAID-exacerbated respiratory disease (N-ERD) clarified by treatment with omalizumab, an anti-IgE antibody Treatment is difficult; even standard therapies like systemic corticosteroids and aspirin desensitization do not always bring the disease under control. If you have asthma and nasal polyps and notice that aspirin or ibuprofen triggers breathing problems, this is worth raising with a specialist.
Reducing the Risks
The most effective strategy for avoiding NSAID complications is also the most obvious: use the lowest effective dose for the shortest time you can. When long-term use is unavoidable, there are several ways to reduce the damage.
For GI protection, proton pump inhibitors are the most studied option. They provide strong acid suppression and have been shown to heal NSAID-associated ulcers even when the NSAID is continued, and they reduce the risk of new ulcers forming compared to taking NSAIDs alone.27PubMed Central. The use of proton pump inhibitors in treating and preventing NSAID-induced mucosal damage Various gastroprotective strategies, including COX-2-selective inhibitors, prostaglandin analogues, and proton pump inhibitors, have been shown to cut the risk of NSAID-related GI complications by roughly 40% to 90%.28PubMed Central. Gastroprotective strategies among NSAID users: guidelines for appropriate use in chronic illness It is worth noting, though, that proton pump inhibitors mainly protect the stomach and upper intestine; they do less for the small-bowel damage described earlier.
Topical NSAIDs are another underused option, especially for localized joint pain. When you rub an NSAID gel or cream on a sore knee, only a small fraction enters the bloodstream. Bioavailability is generally less than 5% compared to an equivalent oral dose, which dramatically reduces exposure to the organs that suffer the most damage.29PubMed. Oral versus topical NSAIDs in rheumatic diseases: a comparison A meta-analysis comparing topical and oral NSAIDs for osteoarthritis confirmed that GI reactions were significantly more common with oral forms. The trade-off is that topical NSAIDs cause about five times more skin reactions like rash and itching at the application site, but these are generally mild and manageable.30PubMed Central. Relative safety and efficacy of topical and oral NSAIDs in the treatment of osteoarthritis: A systematic review and meta-analysis
For people who need long-term pain management, clinical guidelines increasingly recommend multimodal approaches that combine non-drug strategies, including physical therapy, exercise programs, and cognitive behavioral approaches, with medication when needed, rather than relying solely on daily pills. The barriers to adopting these approaches are real: access, cost, time, and skepticism about their effectiveness all play a role. But the evidence supporting them for chronic musculoskeletal pain continues to grow, and for many people they can reduce the dose of NSAIDs needed or eliminate the need entirely.
The Self-Medication Problem
One reason long-term NSAID risks fly under the radar is that most people do not think of these drugs as particularly dangerous. They are sold over the counter, they are cheap, and almost everyone has a bottle in their medicine cabinet. A cross-sectional survey found that roughly half of participants said they always took NSAIDs for new pain without consulting a doctor, and about four in five purchased them over the counter without a prescription. More than 40% chose which NSAID to take based on their own judgment rather than medical advice.31PubMed Central. Awareness of the use of non-steroidal anti-inflammatory drugs: A cross-sectional study
This pattern of casual, self-directed use is how short-term pain relief drifts into chronic daily consumption. Someone starts taking ibuprofen for a sore back, it helps, and three years later they are still taking it every day without having discussed it with anyone. The risks described throughout this article are dose- and duration-dependent, meaning they grow quietly in the background while the user’s attention is on the immediate symptom relief. If you have been taking any NSAID most days for more than a few weeks, that alone is worth a conversation about whether the drug is still the best option or whether the risks have started to outweigh the benefits.