Gout vs Pseudogout: 6 Key Differences to Know
Gout or pseudogout? Crystals, affected joints, age, the role of diet and treatments: the guide to never confuse these two types of arthritis again.
A joint that turns red, swollen and painful overnight: the first thought is usually a gout attack. Yet another condition causes nearly identical attacks and remains widely unknown: pseudogout. In Switzerland, the League against Rheumatism estimates that about 146,000 people have gout, while close to 500,000 people may have cartilage calcification (chondrocalcinosis) — often without knowing it.
Gout and pseudogout belong to the same family — crystal arthritis — but their causes, treatments and, above all, the role of diet are very different. Confusing them can lead to following a useless diet or missing the right treatment. Here are the 6 key differences to know.
Gout and pseudogout: two crystals, one inflammation
In both cases, micro-crystals deposit in the joint and trigger a sudden inflammatory reaction. It is the type of crystal that changes everything:
- Gout: monosodium urate crystals, formed when the uric acid level in the blood is too high (hyperuricemia).
- Pseudogout: calcium pyrophosphate crystals, which deposit in the cartilage and calcify it — a process called chondrocalcinosis.
Chondrocalcinosis is silent at first: it can calcify cartilage for years without pain. We only speak of "pseudogout" when these crystals trigger an acute inflammatory attack.
Comparison table: gout vs pseudogout
| Criterion | Gout | Pseudogout (chondrocalcinosis) |
|---|---|---|
| Crystal involved | Monosodium urate (uric acid) | Calcium pyrophosphate |
| Typical joint | Big toe most often (also ankle, knee) | Knee most often (also wrist, shoulder) |
| Most affected profile | Men aged 40 and over | Older women (65 and over) |
| Role of diet | Major (purines, alcohol, fructose) | Almost none — not diet-related |
| Cause / risk factors | Excess weight, high blood pressure, high cholesterol and blood sugar | Cartilage aging, sometimes an underlying metabolic disease |
| Long-term treatment | Lifelong urate-lowering drug (allopurinol, etc.) | No drug that dissolves the crystals |
The 6 key differences in detail
1. The crystal responsible
Gout is caused by excess uric acid that crystallizes. Pseudogout has nothing to do with uric acid: it comes from calcium deposits in the cartilage. This is why a uric acid blood test can be perfectly normal in pseudogout.
2. The affected joint
Gout very often targets the big toe (known as "podagra"). Pseudogout prefers large joints, first and foremost the knee, then the wrist and shoulder. A first attack in the knee of an older person points more toward pseudogout.
3. The person's profile
Gout is the most common inflammatory arthritis in men aged 40 and over. Pseudogout affects older women more, and its frequency rises sharply with age.
4. The role of diet (the most important difference)
This is the crucial point. In gout, diet plays a major role: limiting high-purine foods, alcohol and fructose genuinely helps reduce attacks. In pseudogout, diet has almost no effect: no food "creates" the calcium crystals.
Key takeaway: if you follow an anti-gout diet seriously but attacks persist, or if they mainly affect the knee, talk to your doctor about possible pseudogout.
5. The root causes
Gout is linked to excess weight, high blood pressure, high cholesterol and high blood sugar (metabolic syndrome). Pseudogout is mainly linked to cartilage aging; it can also reveal an underlying disease (a disorder of calcium, iron or magnesium metabolism), which the doctor will look for.
6. Long-term treatment
For gout, there is an effective long-term treatment: urate-lowering drugs (allopurinol, febuxostat) that dissolve the deposits over time. For pseudogout, there is no equivalent drug able to dissolve the crystals: management mainly aims to calm the attacks and treat any underlying metabolic cause.
How is the diagnosis made?
The symptoms look too similar to tell apart by eye, so the diagnosis relies on precise tests:
- Joint aspiration: a little fluid is drawn from the joint and examined under a polarized-light microscope. Urate crystals (gout) and calcium pyrophosphate crystals (pseudogout) have a different shape and optical behavior — this is the reference test.
- X-ray: it can reveal chondrocalcinosis, a thin line of calcium within the cartilage, a hallmark of pseudogout.
- Blood test: high uric acid points toward gout, but is never enough on its own for the diagnosis.
To learn more about the tests, see our complete guide to diagnosing gout.
What about treating the attack?
Good news: the acute attack is treated in a similar way in both conditions. The doctor may use anti-inflammatories (NSAIDs), colchicine or a corticosteroid injection to calm the inflammation. Rest, ice and elevating the joint also help. The big difference is long-term: diet + urate-lowering therapy for gout, symptomatic management for pseudogout.
To manage an attack, see our emergency first-steps guide.
When to see a doctor?
See a doctor quickly if a joint becomes suddenly red, hot, swollen and very painful — especially if it is the first time, if several joints are involved, or if you have a fever (to rule out a joint infection, which is an emergency). Only a healthcare professional can make the diagnosis and rule out other causes.
Frequently Asked Questions
Is pseudogout more serious than gout?
Neither more nor less: both cause very painful attacks and can damage the joint over time. The difference is that gout has a curative long-term treatment (lowering uric acid), whereas pseudogout is mostly managed case by case, by calming the attacks.
Does an anti-gout diet help against pseudogout?
No. Pseudogout crystals are calcium-based and do not depend on diet. Reducing purines or alcohol therefore has no proven effect on pseudogout. A balanced diet remains good for general health, but it does not replace medical advice.
Can you have gout and pseudogout at the same time?
Yes, it is possible, especially in older people. Both types of crystals can coexist in the same joint, which complicates the diagnosis and justifies joint aspiration.
My uric acid level is normal — does that mean it's pseudogout?
Not necessarily. Uric acid can temporarily drop during a gout attack, so a normal result does not rule out gout. Only examining the joint fluid can settle it with certainty.
Is pseudogout hereditary?
In the vast majority of cases it is linked to age and cartilage aging. There are rare familial and early-onset forms, as well as cases linked to a metabolic disease. Your doctor will assess whether a specific cause should be investigated.
