What should you know about diagnosing pseudogout?

Pseudogout, also called calcium pyrophosphate deposition disease, can cause sudden pain, warmth, swelling and reduced movement. A clinician will ask when the attack began, which joints are affected, whether similar episodes occurred, and what medicines or health conditions may influence your joints. Knee and wrist attacks are common, but other joints can be involved. Blood tests may help look for inflammation or other explanations, while an X-ray or ultrasound can show calcium deposits. These findings support a diagnosis but do not replace examination.

Record the onset of swelling, fever or chills, recent injury, and any previous attacks. Bring a list of medicines and note whether movement or rest changes the pain. Joint aspiration removes a small sample of fluid for laboratory examination and can help distinguish pseudogout from infection or another crystal arthritis. Once the cause is clearer, treatment may include anti-inflammatory medication or, in selected situations, a cortisone injection.

Seek urgent medical assessment for a hot, very swollen joint with fever, chills, severe illness or rapidly worsening pain. Infection can look similar to pseudogout and needs prompt treatment. A new attack, inability to use the limb, or pain after significant injury also warrants timely evaluation.

Ask which tests are needed, whether joint fluid should be analysed, what other conditions are being considered, and how to manage another flare. You can also ask whether joint aspiration, anti-inflammatory medication or a cortisone injection is appropriate for your situation.