Gout and pseudogout can both cause sudden, severe joint pain, warmth, and swelling. The main difference is the type of crystal involved: gout involves monosodium urate crystals, while pseudogout involves calcium pyrophosphate crystals.
Because the symptoms overlap, the appearance or location of a swollen joint cannot reliably tell you which condition you have. Getting the diagnosis right matters because their long-term treatments differ.
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If you are exploring information about gout, you can review this commercial gout resource. A gout-focused product should not be assumed to treat pseudogout or replace a medical diagnosis.
Gout vs Pseudogout at a Glance
| Feature | Gout | Pseudogout |
|---|---|---|
| Crystal involved | Monosodium urate | Calcium pyrophosphate |
| Underlying process | Urate crystals accumulate when uric acid levels remain sufficiently high | Calcium pyrophosphate crystals form in joint tissues |
| Common joint pattern | Often the big toe; ankles, knees, and other joints can be affected | Often the knee; wrists and other joints can be affected |
| Symptoms during an attack | Severe pain, warmth, swelling, and tenderness | Similar pain, warmth, swelling, and tenderness |
| Blood uric acid test | Helps assess gout, but cannot establish the diagnosis by itself | Does not diagnose pseudogout |
| Joint fluid examination | Can identify urate crystals | Can identify calcium pyrophosphate crystals |
| Long-term crystal treatment | Sustained urate lowering can gradually dissolve urate deposits | No established treatment currently dissolves CPP crystals |
These are typical patterns, not rules for diagnosing yourself.
What Is Gout?
Gout is an inflammatory arthritis associated with urate crystal deposits. Uric acid forms when the body breaks down purines, which come from normal body processes and some foods.
High uric acid increases the likelihood of crystal formation, but not everyone with an elevated level develops gout.
Attacks can start abruptly, sometimes overnight. Although the big toe is a familiar location, gout can affect several other joints and may become more persistent over time.
For the underlying process, see what uric acid is and how it relates to gout.
What Is Pseudogout, and Is It the Same as CPPD?
Pseudogout usually refers to an acute attack of calcium pyrophosphate crystal arthritis.
The broader term calcium pyrophosphate deposition disease, or CPPD, includes more than sudden attacks. Some people have ongoing arthritis associated with these deposits, while others have deposits visible on imaging without an acute flare.
The name “pseudogout” reflects its resemblance to gout. It does not mean the pain is less real or that the condition is simply a mild version of gout.
CPPD becomes more common with age. Associations include osteoarthritis, certain inherited conditions, iron overload, low magnesium, and parathyroid abnormalities. Your clinician may investigate contributing conditions when appropriate, particularly if CPPD develops unusually early.
Can You Tell Them Apart From Symptoms?
Usually, symptoms alone are not enough.
A painful big toe may suggest gout, while a swollen knee in an older adult may suggest CPP crystal arthritis. However, gout also affects knees, and CPPD can involve other joints.
The length of an attack is not a reliable home diagnostic test either. Both conditions can cause substantial inflammation and interfere with walking, sleep, and daily activities.
Keep a record of:
- Which joint became painful first.
- How quickly the swelling developed.
- Previous episodes and any confirmed diagnosis.
- Recent illness, surgery, or joint injury.
- Medicines and supplements you take.
Bring this information to your appointment rather than relying on pictures of other people’s joints.
How Doctors Diagnose Gout and Pseudogout
Joint fluid testing
A clinician may use a needle to remove fluid from the swollen joint. This is called joint aspiration.
The fluid can be examined for crystals and, when infection is a concern, tested for bacteria. Identifying the crystal type helps distinguish gout from CPP crystal arthritis.
Finding crystals does not rule out a joint infection. Both can occur together, so other test results and the clinical assessment still matter.
Blood tests
Blood uric acid helps with gout assessment and treatment monitoring. However, a high result does not prove that gout caused the current swelling.
Uric acid can also fall during a gout flare. NICE recommends repeating a result below the diagnostic threshold at least two weeks after the flare settles if gout remains strongly suspected.
There is no equivalent routine blood test that confirms CPP crystals in a joint.
Imaging
X-rays or ultrasound may help identify deposits and assess joint damage. Cartilage calcification, called chondrocalcinosis, can support consideration of CPPD.
Imaging findings need to be interpreted alongside symptoms and other tests. A scan report should not be used on its own to decide which treatment to take.
Before purchasing this commercial gout resource, check whether its information is relevant to your confirmed diagnosis. Advice aimed at lowering uric acid does not automatically apply to CPPD.
How Treatment Differs
Treatment during an attack
Some anti-inflammatory treatments overlap. Depending on your health and other medicines, a clinician may recommend colchicine, a nonsteroidal anti-inflammatory drug, or a corticosteroid.
For a swollen joint, removing fluid and giving a corticosteroid injection may be an option after appropriate assessment for infection.
The choice requires particular care if you have kidney disease, a history of stomach bleeding, or take medicines that interact with the proposed treatment. Do not assume a medicine that helped someone else is suitable for you.
While waiting for treatment to work, resting the painful joint and applying a cold pack wrapped in cloth for around 15–20 minutes may help.
Long-term treatment for gout
When indicated, medicines such as allopurinol lower uric acid. Treatment is adjusted using blood tests to reach and maintain a urate target, allowing deposits to gradually dissolve.
Flare relief and long-term urate control have different roles. Feeling better after an attack does not necessarily mean the underlying deposits have gone.
Read more about long-term gout management.
Long-term treatment for CPPD
CPPD treatment focuses on controlling inflammation, reducing recurrent attacks, and maintaining joint function. Clinicians may consider preventive anti-inflammatory treatment for people with frequent episodes.
Allopurinol does not remove calcium pyrophosphate crystals. If someone has both conditions, however, they may still need it for their gout.
Do not stop prescribed gout medicine simply because CPPD is being considered.
When a Swollen Joint Needs Urgent Assessment
Seek urgent medical assessment for a new, suddenly hot and swollen joint, especially with fever, chills, rapidly worsening pain, or feeling unwell.
Joint infection can resemble either condition and needs prompt treatment. The absence of fever does not reliably exclude infection.
A previous gout diagnosis does not mean every later episode of joint swelling is another gout attack. An unusual episode, or symptoms that fail to improve as expected, deserves reassessment.
Frequently Asked Questions
Can you have gout and pseudogout together?
Yes. Urate and calcium pyrophosphate deposits can coexist. Your clinician may need to consider both when reviewing symptoms and test results.
Does normal uric acid mean I have pseudogout?
No. A normal result does not diagnose pseudogout and does not always exclude gout, particularly during a flare.
If colchicine helps, does that prove it is gout?
No. Colchicine can be used for inflammation associated with either condition. Improvement does not identify the crystal type.
Can pseudogout cause lasting joint problems?
CPPD can be associated with recurrent inflammation and ongoing joint problems. Persistent pain, stiffness, or reduced function warrants follow-up rather than repeatedly treating symptoms without reviewing the diagnosis.
Is pseudogout the same as rheumatoid arthritis?
No. They are different conditions, although some forms of CPPD can resemble other inflammatory arthritis. For the separate comparison, see gout vs rheumatoid arthritis.
You can read the seller’s information about this gout resource here. Check its claims, contents, and refund terms, and discuss proposed treatment changes with your healthcare professional.
Sources and Further Reading
- American College of Rheumatology: Calcium Pyrophosphate Deposition
- NIAMS: Gout
- NICE: Gout—Diagnosis and Management
- Mayo Clinic: Pseudogout Diagnosis and Treatment
- European Bone and Joint Infection Society: Guideline for Septic Arthritis in Native Joints
Medical disclaimer: This article provides general information and does not replace individual medical advice, diagnosis, or treatment.