Arthritis FAQ: Causes, Diet, Lifestyle & Tests

There is no single cause, because "arthritis" covers more than 100 conditions. Osteoarthritis is driven by a mix of joint loading, age, injury and metabolic inflammation; rheumatoid and psoriatic arthritis are autoimmune; and gout is caused by uric acid crystals. Holistic and functional-medicine literature adds proposed upstream drivers such as gut dysbiosis, molecular mimicry from infections, oxidative stress, nutrient gaps and hormonal change. Many of those upstream mechanisms are still emerging or contested rather than settled.

Evidence: Emerging · Go deeper: The root causes of arthritis

Not entirely. Osteoarthritis was long framed as mechanical wear, but it is now understood as a disease of the whole joint, with frequent low-grade inflammation of the joint lining. Obesity is one of the strongest risk factors, and it is linked even to osteoarthritis of the hands, which carry no body weight, so metabolic effects matter as well as load. Fat tissue releases adipokines such as leptin and resistin that have been found in the joint fluid of people with osteoarthritis; how much they drive joint damage on their own is still being worked out.

Evidence: Strong (whole-joint disease, obesity) Emerging (adipokine mechanisms) · Go deeper: The root drivers of osteoarthritis

It depends on the type of arthritis and what “reversed” means. In osteoarthritis, adult cartilage has very limited capacity to repair, but exercise and weight loss can substantially reduce pain and improve function; PRP and stem-cell injections have not been shown in rigorous trials to regrow cartilage. In rheumatoid arthritis, remission is a realistic goal of early treat-to-target therapy, although lasting drug-free remission happens only in a minority. In gout, keeping uric acid below 6 mg/dL dissolves the crystals over months to years. Claims that diet or fasting alone can “cure” established arthritis are not supported, especially from people selling a product or suggesting you stop prescribed medicine.

Evidence: Strong Contested (cartilage regrowth, “cure” claims) · Go deeper: Can arthritis be reversed?

Genes raise susceptibility but rarely act alone. Certain HLA-DRB1 variants (the “shared epitope”) are linked to rheumatoid arthritis, especially in combination with smoking. HLA-B27 is strongly linked to ankylosing spondylitis and related spondyloarthritis, and to a more severe or chronic course of reactive arthritis, although people without HLA-B27 can develop reactive arthritis too. Most people with these genes never develop arthritis, which is why environmental triggers such as smoking, infection and metabolic health matter as well.

Evidence: Strong · Go deeper: Autoimmune triggers & genetic susceptibility

The gut microbiome’s influence on immune activity is a genuine, fast-growing research area. Gut inflammation and spondyloarthritis are closely linked, and an overgrowth of Prevotella copri has been found in people with new-onset rheumatoid arthritis, though cause and effect is not settled. “Leaky gut” as a proven root cause of arthritis is not accepted by mainstream rheumatology, and commercial zonulin tests appear not to measure zonulin at all. Treat it as a plausible hypothesis, not an established fact.

Evidence: Emerging Contested · Go deeper: Leaky gut and arthritis

Yes, in some cases. Reactive arthritis is a recognized condition that can appear several weeks after a gut infection (such as Salmonella, Campylobacter or C. difficile) or Chlamydia. HLA-B27 raises the risk of a more severe or chronic course, but people without it can develop reactive arthritis too, and most infected people never do. Whether “molecular mimicry” from infections such as Epstein-Barr virus or Proteus mirabilis helps start rheumatoid arthritis is still being researched; the Proteus theory is the more contested of the two.

Evidence: Strong (reactive arthritis) Emerging (molecular mimicry) · Go deeper: Reactive arthritis after gut infections; Molecular mimicry & chronic infections

Research suggests a link. Periodontitis is more common in people with rheumatoid arthritis. Porphyromonas gingivalis, a key bacterium in severe gum disease, makes its own enzyme that citrullinates proteins — the kind of altered protein that the anti-CCP antibodies typical of RA recognize. This is a plausible, actively studied mechanism rather than proof that gum disease causes RA. Small studies suggest that treating gum disease may modestly lower RA disease activity, and good dental care is sensible regardless.

Evidence: Emerging · Go deeper: The mucosal origins hypothesis: gums, lungs, gut

Menopause does not cause arthritis by itself, but osteoarthritis becomes markedly more common in women around and after menopause. Falling estrogen is the leading explanation: cartilage and synovium carry estrogen receptors, and animals show more cartilage damage after their ovaries are removed. In women, however, studies show only non-significant trends toward more cartilage loss, and hormone therapy has had inconsistent effects. No guideline recommends hormone therapy to treat osteoarthritis; decisions about hormone therapy should be made with your physician.

Evidence: Strong (association) Emerging (estrogen as the cause) Contested (HRT as treatment) · Go deeper: Estrogen & menopause in osteoarthritis

The Mediterranean dietary pattern has the strongest evidence: a meta-analysis of randomized trials found it lowers hs-CRP and other inflammatory markers, and small trials in rheumatoid arthritis report modest improvements in disease activity and physical function. It emphasizes vegetables, fruit, legumes, whole grains, extra-virgin olive oil, nuts and oily fish. It is a pattern, not a cure, and works best alongside medical care.

Evidence: Strong (inflammatory markers) Emerging (RA disease activity) · Go deeper: Evidence for dietary interventions

Sugar-sweetened drinks and fructose (from table sugar and high-fructose corn syrup) raise uric acid and are linked to a higher risk of gout in large cohorts of men and women. Sugary drinks also promote weight gain, which loads the joints. Beyond gout the picture is less clear: daily sugary soda was linked to seropositive rheumatoid arthritis in one U.S. cohort but not in a French one, short-term studies of sugar and inflammatory markers are mixed, and how much diet adds to the age-related build-up of AGEs in cartilage is unknown. Natural sugar in whole fruit behaves differently from added sugar.

Evidence: Strong (gout) Emerging (RA, OA) Contested (inflammatory markers) · Go deeper: Sugar and joint pain

There is no good evidence that tomatoes, peppers, eggplant or potatoes cause arthritis, and no published randomized trial (as of October 2026) shows that avoiding them helps. The idea traces largely to uncontrolled survey reports. Glycoalkaloids damaged the gut barrier only in mice bred to develop bowel inflammation, and small trials link tomato juice and pigmented potatoes to lower levels of some inflammatory markers. If you suspect a reaction, a 3–4 week elimination followed by one-at-a-time reintroduction, tracked in a diary, is more informative than permanently cutting out nutritious vegetables.

Evidence: Contested · Go deeper: Nightshades and arthritis

In celiac disease, which affects roughly 1 in 100 people, gluten is a genuine cause of joint symptoms, and about 1 in 10 people with celiac disease report joint complaints. Outside celiac disease the evidence is weak: in blinded challenges only about 16% of people with suspected gluten sensitivity react to gluten itself, and the rheumatoid arthritis trials tested gluten-free vegan diets that changed too many things to isolate gluten. French rheumatology guidance advises against a gluten-free diet for inflammatory arthritis without celiac disease. If you suspect a problem, get tested for celiac disease before cutting gluten, because the tests only work while you are eating it.

Evidence: Strong (celiac disease) Contested (without celiac disease) · Go deeper: Gluten and joint pain

Dairy is not an established cause of arthritis. It is not associated with a higher risk of rheumatoid arthritis, has not raised inflammatory markers in randomized trials, and is linked to a lower risk of gout. Some proponents blame A1 beta-casein, which releases the peptide BCM-7 during digestion, but an independent review found moderate-certainty evidence only for effects on digestive symptoms in people who report milk intolerance, and no arthritis trials. French rheumatology guidance advises against dairy-free diets for inflammatory arthritis. Trying A2 milk is a personal experiment, not a prescription.

Evidence: Contested (A1 dairy) · Go deeper: Dairy: A1 vs A2 casein

Trials do not support the claim. Proponents argue that omega-6-rich oils such as soybean and corn oil feed pro-inflammatory eicosanoids, but a systematic review of 15 randomized trials found that eating more linoleic acid did not raise CRP or inflammatory cytokines, and changing linoleic acid intake did not change arachidonic acid levels in the blood. No trial has tested avoiding seed oils in arthritis. Industrial trans fats and partially hydrogenated oils, by contrast, are linked to inflammation and are worth avoiding.

Evidence: Contested (seed oils as inflammatory) Strong (trans fats) · Go deeper: Industrial seed oils & trans fats

Yes, this is one of the firmest diet links in arthritis. In a large cohort of men, each daily serving of beer was linked to about 49% higher gout risk and spirits to about 15%, while moderate wine was not; in people who already have gout, more alcohol of any type in the previous 24 hours raised flare risk. Men in the top fifth of meat intake had about 41% higher risk, and of seafood about 51%, while purine-rich vegetables were not linked to gout. Red meat’s broader role in other types of arthritis is contested.

Evidence: Strong · Go deeper: Gout: alcohol, meat & seafood

Some help a little; none is a cure. In knee osteoarthritis, curcumin extracts (from turmeric) reduced pain in short, small trials of low to moderate quality, while the evidence in rheumatoid arthritis is very weak. Fish oil shows at most a small benefit in rheumatoid arthritis, mainly less NSAID use. Glucosamine and chondroitin did not beat placebo overall in the large GAIT trial, and vitamin D did not slow knee osteoarthritis, although a confirmed deficiency should be corrected. Supplements can interact with medicines: vitamin K directly opposes warfarin, several supplements add to bleeding risk with blood thinners, and turmeric has rarely caused liver injury. Discuss them with your doctor before starting.

Evidence: Emerging (curcumin, omega-3) Contested (glucosamine, vitamin D for OA) · Go deeper: Turmeric for arthritis; Supplements compared

The evidence is mixed. In a small 1991 randomized trial, a 7–10 day fast followed by a year of vegetarian eating improved rheumatoid arthritis symptoms and inflammatory markers, and the benefits were still present a year later; after fasting alone, most people relapse when they start eating again. A 2022 trial found that a fast followed by a plant-based diet was no better than a guideline-based healthy diet for physical function. Fasting can be unsafe for people with diabetes, low body weight, pregnancy, an eating-disorder history, or certain medications, and should only be done under medical supervision.

Evidence: Contested · Go deeper: Medically supervised fasting

Many people notice flares during stressful periods: in one study of people with rheumatoid arthritis, 86% named stress or mood as a cause of their symptoms, and poorer mental health predicted who flared when medication was tapered. Stress acts on the HPA axis and nervous system and lowers the pain threshold, but most of the evidence is observational, and a flare is itself stressful, so cause and effect are hard to separate. Bone harm from cortisol is proven for long-term steroid medicines, not for everyday stress. Stress-reduction practices are low-risk and worth discussing as part of your care.

Evidence: Emerging · Go deeper: Psychological stress and flares

Poor sleep reliably makes pain worse: in a lab study, one night of partial sleep loss increased pain and the number of painful joints the next day in people with rheumatoid arthritis. Its effect on inflammation is less consistent. Restricting sleep to about four hours a night for ten days raised CRP in one small study and IL-6 in another, but a meta-analysis of 72 studies found no consistent effect of experimental sleep loss on CRP or IL-6, while ongoing disturbed sleep was linked to modestly higher levels. Pain also disrupts sleep, so the two can feed each other; consistent, restorative sleep is a reasonable goal to work on with your clinician.

Evidence: Strong (pain) Emerging (inflammation, flares) · Go deeper: Poor sleep and flares; Sleep and inflammatory markers

For most people, regular joint-friendly movement helps: exercise is a first-line, strongly recommended treatment for knee, hip and hand osteoarthritis, it is the only strong recommendation in the 2022 American College of Rheumatology guideline on lifestyle measures in rheumatoid arthritis, and it does not wear joints out faster. Proponents also argue that inactivity lets inflammatory mediators pool in the joint, because cartilage relies on movement to circulate fluid — a plausible but untested idea. The right type and amount of activity depends on your joints, so plan it with a clinician or physical therapist.

Evidence: Strong Emerging · Go deeper: Exercise & movement for arthritis

Yes, especially for knee and hip osteoarthritis. Excess body weight is one of the best-established modifiable contributors: each pound lost takes roughly four pounds of load off the knee with every step, and in the IDEA trial, diet plus exercise that cut body weight by about 11% gave the biggest improvements in pain and function. Fat tissue also releases inflammatory adipokines such as leptin; how much this harms joints apart from the extra load is still being studied. Any plan to change weight should be tailored with your healthcare professional.

Evidence: Strong (weight loss) Emerging (adipokine mechanisms) · Go deeper: Weight loss for osteoarthritis

Smoking is a well-established risk factor for developing rheumatoid arthritis, particularly the anti-CCP-positive form. A meta-analysis found about 1.9 times the risk in men who had ever smoked and about 1.3 times in women, with higher risk in heavy smokers, and the risk is many times higher in people who also carry certain HLA-DRB1 genes. Risk falls slowly after quitting. Cigarette smoke also contains cadmium, which is being studied as a possible contributor. Not smoking is one of the clearest steps for joint and overall health.

Evidence: Strong (smoking) Emerging (cadmium) · Go deeper: Smoking and other RA risk factors

Research is split. A large UK smartphone study found small links between pain and higher humidity, lower air pressure and stronger wind, while an analysis of 11.7 million U.S. outpatient visits and a study of people with knee osteoarthritis found no meaningful link. Gout is a partial exception: hot weather over the previous two days was linked to more attacks, possibly through dehydration. Weather does not cause or damage arthritis; any effect is small on average and may differ between people. Keeping active, warm and well hydrated is sensible whatever the evidence shows.

Evidence: Contested · Go deeper: Weather and barometric pressure

Habitual knuckle cracking has not been shown to cause arthritis. The popping sound comes from gas bubbles in the joint fluid, and studies comparing habitual crackers with non-crackers have found no higher rate of hand osteoarthritis. The studies are small, but their findings are consistent; if cracking is painful or comes with swelling, get it checked.

Evidence: Strong · Go deeper: What actually drives arthritis

Some practitioners argue that mycotoxins from water-damaged buildings cause widespread joint pain and fatigue that mimics seronegative rheumatoid arthritis or fibromyalgia, and one cross-sectional survey found self-reported arthritis somewhat more common in people reporting household mold. Clinical immunology reviews, however, find no evidence linking mold exposure to autoimmune disease, and urine mycotoxin and mold antibody tests are not validated. Unexplained joint pain has many possible causes and deserves a proper medical work-up.

Evidence: Contested · Go deeper: Mold mycotoxins & water-damaged buildings

Fluoroquinolone antibiotics such as ciprofloxacin and levofloxacin have carried an FDA boxed warning since 2008 for tendinitis and tendon rupture, most often of the Achilles tendon. The absolute risk is low for most people — a few extra ruptures per 10,000 courses — but it rises sharply over age 60 and with corticosteroids, kidney disease or an organ transplant. Cartilage damage has been shown in young animals, but lasting cartilage harm in adults has not. Regulators say these drugs should not be first choice for mild infections when alternatives exist, yet they can still be the right choice for serious infections; raise any tendon history or steroid use with your prescriber.

Evidence: Strong (tendons) Emerging (cartilage) · Go deeper: Fluoroquinolones and tendons

This is contested. Some functional-medicine sources argue that long-term NSAIDs blunt cartilage repair. In the lab the effect depends on the drug: naproxen, ibuprofen and indomethacin inhibit cartilage matrix production, while some others do not. Trial evidence of faster joint damage exists only for indomethacin; for commonly used NSAIDs the evidence is mixed and mostly observational. Guidelines still strongly recommend oral NSAIDs for knee and hip osteoarthritis, at the lowest effective dose because of stomach, kidney and heart risks. If you are weighing long-term use, discuss dose and duration with your physician.

Evidence: Contested · Go deeper: The NSAID paradox

Long-term corticosteroids such as prednisone are well documented to cause bone loss (glucocorticoid-induced osteoporosis), and they are the leading cause of non-traumatic osteonecrosis, in which bone beneath a joint loses its blood supply. Short courses carry much less of this risk, and steroids are genuinely valuable for severe flares. Doctors manage the risk with the lowest effective dose and bone monitoring, so keep up with follow-ups rather than adjusting doses yourself.

Evidence: Strong · Go deeper: Long-term corticosteroids

Thiazide and loop diuretics (such as hydrochlorothiazide and furosemide) raise uric acid by reducing its excretion; they are linked to a higher risk of gout and to flares after starting them. Other blood pressure medicines differ: losartan and calcium-channel blockers are associated with a lower risk of gout. If you have gout and take a diuretic, your doctor can review whether an alternative suits you, but do not stop it on your own.

Evidence: Strong · Go deeper: Diuretics & other drugs that raise urate

Muscle aches on statins are common, but in 19 double-blind trials of about 124,000 people, muscle pain or weakness was reported almost as often on placebo (26.6%) as on a statin (27.1%); in the first year, only about 1 in 15 muscle reports among statin users was caused by the drug. Rare serious muscle problems do occur, so report marked weakness or dark urine promptly. The popular claim that CoQ10 supplements fix statin aches has mixed trial results. Most people with symptoms can stay protected by switching statin, lowering the dose or trying another cholesterol-lowering drug with their prescriber.

Evidence: Strong Contested (CoQ10) · Go deeper: Statins and joint pain

Long-term proton pump inhibitors such as omeprazole are linked to low magnesium and low vitamin B12. Proponents argue that magnesium depletion may add to joint and bone strain, but any effect on arthritis itself is unproven. Ask your doctor whether long-term use is still needed and whether levels should be checked, rather than self-supplementing.

Evidence: Strong (low magnesium, B12) Contested (joint effects) · Go deeper: Proton pump inhibitors

The most widely used tests are C-reactive protein (CRP) and the erythrocyte sedimentation rate (ESR). Both rise with systemic inflammation and often track active inflammatory arthritis, but they also rise with infection, injury and other conditions, and they can be normal in active disease. High-sensitivity CRP (hs-CRP) is the same molecule measured at low levels; its cut-offs of below 1, 1–3 and above 3 mg/L describe cardiovascular risk, not arthritis activity. Cytokines such as IL-6 and TNF-alpha sit upstream of CRP but are not routine office tests.

Evidence: Strong · Go deeper: CRP vs ESR

No single test diagnoses rheumatoid arthritis. Anti-CCP antibodies are about 95% specific for RA and can appear years before symptoms, but about a third of people with RA test negative. Rheumatoid factor (RF) is less specific and can be positive in other conditions or in healthy older people. A rheumatologist combines these results with symptoms, examination and sometimes imaging.

Evidence: Strong · Go deeper: Anti-CCP and rheumatoid factor

Both measure inflammation indirectly. CRP is a protein the liver makes in response to IL-6; it rises within hours and falls within days. ESR measures how fast red blood cells settle, changes over weeks, and is pushed up by age, female sex, anemia, pregnancy and kidney disease. The two disagree in roughly 1 in 8 paired results, so clinicians often order them together and interpret them in context.

Evidence: Strong · Go deeper: CRP vs ESR compared

Gout becomes more likely as serum uric acid rises above about 6.8 mg/dL, the level at which urate crystals can form. In one long-term study of men, about 4.9% a year of those at 9 mg/dL or more developed gout, compared with 0.1% below 7 mg/dL, so many people with high uric acid never get gout. For people on urate-lowering treatment, the ACR target is below 6 mg/dL. Levels can be normal during an attack. Reference ranges vary between labs, so interpret your result with your doctor.

Evidence: Strong · Go deeper: Hyperuricemia thresholds

Yes. Osteoarthritis usually shows normal inflammatory markers, gout is often normal between flares, and a third or more of people with rheumatoid arthritis can have normal ESR and CRP. Some people with inflammatory arthritis are also “seronegative” — negative for RF and anti-CCP. Diagnosis relies on symptoms, examination and often imaging, not blood tests alone. Persistent joint pain or swelling deserves evaluation even if your labs look normal.

Evidence: Strong · Go deeper: When results are normal

Osteoarthritis is far more common (about 595 million people worldwide in 2020, compared with about 17.6 million with rheumatoid arthritis). It is a whole-joint degenerative disease with low-grade local inflammation, typically in the knees, hips, hands and spine. Rheumatoid arthritis is a systemic autoimmune disease in which the immune system attacks the joint lining, usually symmetrically in the small joints of the hands and feet. A useful clue is morning stiffness: under 30 minutes suggests osteoarthritis, while longer stiffness suggests inflammatory arthritis. RA needs prompt specialist treatment to prevent joint damage.

Evidence: Strong · Go deeper: Rheumatoid arthritis vs osteoarthritis

Gout is an inflammatory arthritis caused by urate crystals forming in and around a joint, often the big toe, after uric acid has stayed high for a long time. Most people with gout clear uric acid poorly, because of genes, insulin resistance, kidney function or medicines such as diuretics; beer, spirits, sugary drinks and large amounts of meat and seafood add to the load. For recurrent gout, urate-lowering medicine taken to a target below 6 mg/dL dissolves the crystals and prevents flares, so recurring attacks are worth discussing with your doctor.

Evidence: Strong · Go deeper: Gout & uric acid

Psoriatic arthritis is an inflammatory arthritis that develops in about 1 in 5 people with psoriasis (19.7% in a pooled analysis), usually after the skin disease. It can affect the joints, the points where tendons attach to bone, the spine, and whole fingers or toes. It is driven by the IL-23/IL-17 and TNF pathways, and drugs that block them work. Damage can come quickly, so swollen joints, “sausage” digits or heel pain in someone with psoriasis deserve prompt referral. Obesity raises the risk; gut links are being studied, and a gluten-free diet is suggested only for people with psoriasis who test positive for markers of gluten sensitivity.

Evidence: Strong Emerging (gut links, diet) · Go deeper: Psoriatic arthritis

Yes. Arthritis is not only a disease of older age: rheumatoid arthritis often starts between 30 and 60, reactive arthritis commonly affects young adults after an infection, and juvenile idiopathic arthritis affects children. A serious knee injury raises the risk of knee osteoarthritis about four- to six-fold, often 10 to 20 years later, so post-traumatic osteoarthritis can appear in people in their 30s and 40s. Persistent joint pain, swelling or stiffness at any age should be checked by a doctor.

Evidence: Strong · Go deeper: Autoimmune and post-infectious triggers; Joint injury & osteoarthritis