Pseudogout

Overview

Pseudogout is a type of inflammatory arthritis that can cause sudden pain, swelling, warmth, and stiffness in a joint. It is related to the buildup of calcium pyrophosphate crystals in and around the joints. For this reason, it may also be called calcium pyrophosphate deposition disease, or CPPD.

The condition is called “pseudogout” because an attack can look similar to gout, another crystal-related arthritis. However, the crystals involved are different, and the conditions are evaluated and managed differently. Pseudogout most often affects older adults and commonly involves larger joints, especially the knee. It can also affect the wrist, ankle, shoulder, elbow, or other joints.

Pseudogout attacks may come on suddenly and may improve over time, but symptoms can be uncomfortable and may interfere with walking, hand use, and daily activities. Some people have only one episode, while others may experience repeated attacks or longer-lasting joint symptoms.

Symptoms

Symptoms of pseudogout can vary from mild to severe. A flare may affect one joint or more than one joint at the same time.

• Sudden joint pain, often in the knee or wrist
• Swelling around the affected joint
• Warmth and tenderness over the joint
• Redness of the skin in some cases
• Stiffness or reduced range of motion
• Difficulty using the joint, such as walking or gripping objects
• General discomfort or tiredness during a significant flare

In some people, CPPD may cause ongoing joint discomfort that resembles osteoarthritis, with chronic stiffness, aching, or reduced function. In others, calcium pyrophosphate crystals are found on imaging tests without causing noticeable symptoms.

Causes and Risk Factors

Pseudogout occurs when calcium pyrophosphate crystals form in joint cartilage or surrounding tissues. These crystals can irritate the joint lining and trigger inflammation. The exact reason crystals form is not always clear.

Risk factors that may increase the likelihood of pseudogout include:

• Older age, as CPPD becomes more common with aging
• Previous joint injury or joint surgery
• Osteoarthritis or other joint wear-and-tear changes
• Family history of CPPD in some cases
• Certain metabolic or endocrine conditions that affect calcium, iron, magnesium, or thyroid-related balance

A pseudogout flare may sometimes occur after illness, surgery, or physical stress on the body. However, many attacks happen without an obvious trigger.

Diagnosis

A rheumatology evaluation usually begins with a discussion of symptoms, medical history, and a physical examination of the affected joint. Because several conditions can cause sudden joint swelling, including gout, infection, injury, and other forms of arthritis, accurate diagnosis is important.

Tests that may be used include:

• Joint fluid analysis, where a small sample of fluid is taken from the swollen joint and examined for crystals and signs of inflammation
• Imaging tests, such as X-rays or ultrasound, which may show crystal deposits or joint changes
• Blood tests to look for inflammation, rule out other conditions, or check for associated metabolic problems

Joint fluid testing is often especially helpful because it can identify the type of crystals present and help exclude joint infection, which can be serious and may require urgent care.

Treatment Options

Treatment for pseudogout focuses on reducing inflammation, relieving symptoms, improving joint function, and preventing complications where possible. The approach depends on the joint involved, symptom severity, overall health, and whether attacks are occasional or recurrent.

During an acute flare, a doctor may recommend treatments to control pain and inflammation. These may include anti-inflammatory medicines, joint fluid removal to reduce pressure, or an injection into the joint in selected cases. The choice of treatment must consider the person’s age, kidney function, stomach health, heart health, other medical conditions, and current medications.

Supportive measures, such as resting the painful joint for a short period and using appropriate physical support, may be advised by a healthcare professional. Once the acute pain settles, gentle movement and rehabilitation may help restore flexibility and strength. For people with repeated attacks or chronic CPPD-related arthritis, a rheumatologist may discuss longer-term management strategies and monitoring.

There is no simple way to remove all calcium pyrophosphate crystals from the joints. However, many people can manage symptoms effectively with individualized medical care. If an associated metabolic condition is found, treating or monitoring that condition may be part of the overall plan.

When to See a Doctor

Medical assessment is recommended for any sudden, unexplained joint swelling, especially if the joint is very painful, warm, or difficult to move. Prompt evaluation is important because joint infection and other urgent conditions can look similar to pseudogout.

Seek medical care urgently if joint swelling is accompanied by fever, chills, severe illness, rapidly worsening pain, or inability to bear weight or use the joint. People with a weakened immune system, recent surgery, joint replacement, or a recent injury should also be assessed promptly.

It is also advisable to see a doctor if joint attacks keep returning, if symptoms do not improve as expected, or if ongoing stiffness and pain affect daily activities. A rheumatology specialist can help confirm the diagnosis, rule out other causes, and create a safe treatment plan based on the individual’s medical needs.